Philippine police tracked down a suspect in a series of grisly robberies and murders with the help of his Facebook account, officials said today.

Mark Dizon, a 28-year-old computer technician, did not resist when arrested today while talking with his father in a public square in northern San Fernando city, police Senior Superintendent Danilo Bautista said.

He is accused of killing nine people --six Filipinos, an American, a Canadian and a Briton -- in three different robberies at hotels and homes this month in Angeles city. The area, near the former US-run Clark Air Force Base some 80 kilometres northwest of Manila, is home to many retired expatriates.

Dizon, who is from a well-off family and according to police had a fascination with guns, was Facebook friends with the daughter of one of the victims. A friend of her family showed his photo on the popular social networking site to witnesses to help identify him, police said.

"He was fond of computers and this gave him away," Bautista told The Associated Press.

The string of deadly robberies started July 12, when Canadian Geoffrey Alan Bennun, 60, and his Filipino girlfriend were shot to death after a robber broke into their hotel room.