TEHRAN, Iran (CNN) — Hundreds of Iranian students crowded outside the British Embassy in Tehran on Sunday, setting off firecrackers and hurling projectiles toward the compound, an embassy spokesman said.
No one was injured and there was no damage in the protest, which continued into the late afternoon, the spokesman said.
The students are protesting the alleged trespass of 15 British marines and sailors into Iranian waters on March 23.
Britain and Iraq say the Britons were well inside Iraqi waters, and London is demanding the release of the 15 detainees.
Iran has not allowed British ambassadors access to the Britons, who are being held at an undisclosed location in Iran.
Video from earlier in the day showed Iranians of all ages crowded around the embassy while Iranian forces maintained a cordon around the peaceful crowd, which chanted and waved flags.
U.S. President George W. Bush called Iran's detention of the sailors "inexcusable behavior" and called for their release, referring to them as "hostages."
"The Iranians took these people out of Iraqi water," said Bush, speaking Saturday at Camp David with Brazilian President Luiz Inacio Lula da Silva. "And it's inexcusable behavior."
The U.S. government had been notably quiet on the subject from the beginning, but Bush voiced strong opinions Saturday.
"The Iranians must give back the hostages," he said. "They were innocent. They were doing nothing wrong. And they were summarily plucked out of water." (Watch President Bush's address )
Also Saturday, an Iranian official said his country had started a legal process to determine the guilt or innocence of the detainees.