U.S. experts examine footage of rocket-propelled grenade attack on U.S. Embassy in Athens

(AP) FBI agents are helping investigate last week's rocket-propelled grenade attack on the U.S. Embassy, trying to enhance security camera footage, the American ambassador said Tuesday.

The Jan. 12 attack was the first major strike on a Western target by suspected left-wing Greek militants in six years. It smashed a window and damaged a third-floor bathroom in the heavily fortified glass and concrete embassy. Nobody was hurt.

FBI experts flew in over the weekend and were working on the security footage, said U.S. Ambassador Charles Ries.

"It shows the missile streaking across the street and into the embassy," he told state NET television. "It was dark, it's not as good as we want. We're bringing in some experts to see what they can do in terms of looking at the files, ways to enhance it."

"The FBI is involved ... providing us their best people," he said.

Police have blamed Greek left-wing militants for the attack, but there have been no arrests and no claim of responsibility.

Greek law enforcement authorities are also seeking access to footage recorded by traffic cameras just outside the embassy compound.

But the move has provoked a debate about privacy rights, and the country's Data Protection Agency has imposed restrictions blocking police access to the footage.

The camera network was part of a $1.3 billion security umbrella bought for the 2004 Athens Olympics. Government spokesman Evangelos Antonaros said it proved useful during the games.

"How can some people now persuasively claim that this efficient system should not be used to protect Greek citizens' life and security?" Antonaros said.