(CNN) -- The international community on Monday condemned an Israeli naval commando raid on a flotilla carrying aid for Palestinians in Gaza, leaving 9 people dead.

Israel claimed it was defending itself, with the Israel Defense Forces (IDF) saying the soldiers' lives were in danger after they were attacked with "severe physical violence, including live fire, weapons, knives and clubs."

The Free Gaza Movement, one of the organizers of the aid, said that Israeli commandos dropped from a helicopter onto the deck of one of the ships and "immediately opened fire on unarmed civilians."

A senior Israeli military official, speaking on condition of anonymity in an independent account cleared by military censors, said Israeli troops were planning to deal with peace activists on a Gaza-bound flotilla, "not to fight."

The military official said most of the nine deaths were Turks. Twenty people were wounded. Seven Israeli soldiers were also wounded, one seriously.

All six boats in the flotilla were boarded according to the IDF but only one, the Mavi Mamara, offered resistance; the other five surrendered peacefully, the military said.

A host of nations condemned the military action and called for an investigation.

On Monday Israeli Prime Minister Benjamin Netanyahu canceled Tuesday's scheduled meeting with U.S. President Barack Obama, according to Israeli government officials.

The United Nations Security Council will hold talks at 1 p.m. ET Monday on the incident.

UN Secretary-General Ban Ki-moon said Monday he was "shocked by reports of killing of people in boats carrying supplies to Gaza. I condemn the violence and Israel must explain."

The Spanish and French governments called the action "disproportionate." The Italian foreign minister asked the European Union to investigate, and several nations, including Greece and Sweden, were summoning their Israeli ambassadors.

An indignant Turkey recalled its ambassador from Israel, canceled three planned military exercises with the Israeli military and called home its youth national football team, which had two games scheduled in Israel, said Deputy Prime Minister Bulent Arinc.

Prime Minister Recep Tayyip Erdogan was in Chile, but will return after meeting with the Chilean president, Arinc said. The chief of the Turkish military was cutting short a trip to Egypt. The Turkish foreign minister, in Venezuela, was calling the United Nations Security Council to an emergency meeting, Arinc said.

"This operation will leave a bloody stain on the history of humanity," Arinc said. A Turkish group, the Humanitarian Relief Foundation or IHH, was one of the organizers of the flotilla, but people from various nations were aboard.

In a statement, Bahrain called it a "barbaric attack" on the part of Israel.

The British Foreign Minister William Hague said: "We have consistently advised against attempting to access Gaza in this way, because of the risks involved. But at the same time, there is a clear need for Israel to act with restraint and in line with international obligations."

Fifteen of the people captured were transferred to an Israeli prison in Beer Sheva, a spokesman for the Israeli Prison authority said Monday.

The Free Gaza Movement, one of the groups sponsoring the flotilla, disputed Israel's claim of violence by people aboard the ships.

"At about 4:30 am, Israeli commandos dropped from a helicopter onto deck of Turkish ship, immediately opened fire on unarmed civilians," said a post on the group's Twitter page.

Video aired on CNN sister network CNN Turk showed soldiers abseiling onto the deck of a ship from a helicopter above. The boarding of the ships took place more than 70 nautical miles outside Israeli territorial waters, according to IHH.

The Turkish foreign ministry said the incident "might cause irreversible consequences" in the nation's relationship with Israel.

"Israel has once again clearly demonstrated that it does not value human lives and peaceful initiatives through targeting innocent civilians," the statement said. "We strongly condemn these inhuman acts of Israel."

Meanwhile, a protest that began outside the Israeli embassy in Istanbul on Sunday continued into Monday. Although largely peaceful, police did use water cannons at one point to keep demonstrators at bay. Israel issued a "serious travel warning" for Israelis visiting Turkey. Those planning to travel to Turkey were asked to postpone their trip, while those in Turkey were advised to stay indoors.

The Israeli PM office has issues a serious travel warning for Israeli travelers visiting Turkey. The warning calls Israelis who are about to travel into Turkey to postpone their trip and for Israelis in Turkey to remain indoors and avoid presence in the city centers.

In Gaza, where the flotilla was headed, Hamas spokesman Sami Abu Zuhri called for global support of the Palestinian cause.

"The Israeli attack on the Freedom Flotilla is an ugly crime and against international law and this reflects the nature of the criminal Israeli occupation," Zuhri said. "We call upon the free world Arab and Muslim world to stand in support and help and support the international activists who have been subjected to killing in the middle of the sea."

Palestinian President Mahmoud Abbas called for three days of mourning in the Palestinian territories to honor the lives lost.

Israeli government spokesman Mark Regev accused the leaders of the flotilla of looking for a fight.

"They wanted to make a political statement. They wanted violence," according to Regev, who said Israel wanted a peaceful interception of the ships trying to break Israel's blockade of Gaza. "They are directly responsible for the violence and the deaths that occurred."

The convoy of boats approached Gaza in defiance of an Israeli blockade and had been shadowed by three Israeli warships. Free Gaza had reported Sunday that they had been contacted by the Israeli navy.

The boats left European ports in a consolidated protest organized by two pro-Palestinian groups to deliver tons of food and other aid to Gaza to break a blockade imposed by Israel in 2007.

The maritime convoys were organized by both the Free Gaza Movement and the IHH, a humanitarian relief foundation affiliated with the Muslim Brotherhood religious group.

Israel said Sunday that Western and Turkish authorities have accused IHH of having "working relations" with different terrorist organizations.

The fact that they boarded (probably to search) the ships isn't bad, it's still Israeli territory and these people were violating it. What's disturbing is the number of people who would defend Israel if the Free Gaza Movement's claims turn out to be accurate, that they just started shooting without provocation.

All six boats in the flotilla were boarded according to the IDF but only one, the Mavi Mamara, offered resistance; the other five surrendered peacefully, the military said.

The news here, from an Israeli PR flack, was reporting that the initial resistance was with sticks/clubs, and that the live fire was actually from a captured Israeli pistol.

Seems amazing to me. I find it very hard to imagine an Israeli commando boarding party allowing their weapons to be used against them, but there you are.

Im reserving any judgement till the full details come out, but boarding in international waters at nighttime seems asking for a panic reaction; still, if its genuinely a humanitarian mission Im not sure why the goods couldnt simply be cleared through the UN and certified under bond, removing the necessity for a weapons/customs check. Do Israel not trust the UN?

The military official said most of the nine deaths were Turks. Twenty people were wounded. Seven Israeli soldiers were also wounded, one seriously.

At that point I would have gotten my men off the boat and sunk it with rockets.

So would you have problems with it if Israel had allowed the ships to reach the blockade and then sunk them?

Of course.

First, Israel has not been managing it's blockade well, and has not allowed sufficient humanitarian goods through. This results in ALLIES of Israel determining it necessary to make a point and run the blockade. So far, in terms of fault, we're even IMO.

If Israel had suspected (with reasonable evidence to support this) that the ships carried goods of war, then they could/should be stormed or captured in some fashion.

If not, then this becomes an unjustified attack.

Regardless, it's stupidity on the part of Israel. They have not shown me that they are overwhelmingly interested in the well being of Gaza civilians. This, at a minimum, is self-induced bad press that they don't need. Israel is the Mike Tyson to Gaza's "***** who steps" and it's getting very old.

Regardless, it's stupidity on the part of Israel. They have not shown me that they are overwhelmingly interested in the well being of Gaza civilians.