RAMALLAH, West Bank—An adviser to Mahmoud Abbas says the Palestinian president sees no need to quit indirect Mideast peace talks over Israel's interception of a Gaza-bound ship.

The killing of nine pro-Palestinian activists in Monday's Israeli raid has raised concern that U.S.-led efforts to broker an Israeli-Palestinian peace deal could be disrupted.

Abbas met late Monday with senior PLO officials to assess the situation. Abbas adviser Mohammed Ishtayeh says Abbas told the group there is no need to quit the negotiations since the Palestinians are talking to the U.S. and not to Israel.

THIS IS A BREAKING NEWS UPDATE. Check back soon for further information. AP's earlier story is below.

JERUSALEM (AP) -- Israeli commandos rappelled down to an aid flotilla sailing to thwart a Gaza blockade on Monday, clashing with pro-Palestinian activists on the lead ship in a botched raid that left at least nine passengers dead.

Bloodied passengers sprawled on the deck and troops dived into the sea to save themselves during several hours of hand-to-hand fighting that injured dozens of activists and six soldiers. Hundreds of activists -- many of whom were apparently Turkish -- were towed from the international waters to Israeli detention centers and hospitals.

International condemnation was swift and harsh as Israel scrambled to explain how what was meant to be a simple takeover of a civilian vessel went so badly awry.

Israeli Prime Minister Benjamin Netanyahu abruptly canceled a planned meeting with President Barack Obama in Washington to rush home. The global reaction appeared likely to increase pressure to end the embargo that has plunged Gaza's 1.5 million residents deeper into poverty.

Most of the information about what happened on the single ship where violence broke out came from Israel, which cut off all communication to and from the activists and provided testimony and video evidence that its soldiers came under attack by activists armed with metal rods, knives, slingshots and two pistols snatched from the troops.

Passengers reached at an Israeli hospital and journalists aboard the ship accused the soldiers of using excessive force. One passenger, who identified himself as American, spoke briefly with reporters.

"I'm not violent. What I can tell you is that there are bruises all over my body. They won't let me show them to you," he said before he was pushed away by a security escort.

A soldier identified only as a sergeant told reporters at a military briefing that the activists on board "were armed with knives, scissors, pepper spray and guns." He said he was armed only with a paintball rifle. "It was a civilian paintball gun that any 12-year-old can play with," he said. "I saw my friends on the deck spitting blood."