father of a San Diego State University student whose body was pulled from a river in Spain says he has not ruled out foul play in his son's death.

Local resident Manuel Calderon, a retired military engineer, right looks over into the river Manzanares beside a memorial of flowers and candles for U.S. student Austin Bice, in Madrid Wednesday March 9, 2011. The body of San Diego State U.S. exchange student Austin Bice, was found Tuesday in the river 10 days after he went missing following a night out, a police official said. The sign says 'Murdered in Madrid, Americans demand Justice', even though a Spanish official says forensic experts are still to carry out an autopsy but it could take weeks before the result is known. (AP Photo/Paul White)

An unidentified youth looks at a memorial of candles and flowers for U.S. student Austin Bice, by the river Manzanares in Madrid Wednesday March 9, 2011. The body of San Diego State U.S. exchange student Austin Bice, was found Tuesday in the river 10 days after he went missing following a night out, a police official said. The sign says 'Murdered in Madrid, Americans demand Justice', even though a Spanish official says forensic experts are still to carry out an autopsy but it could take weeks before the result is known. (AP Photo/Paul White)

Police cover up the body of a U.S. exchange student, in Madrid, Tuesday March 8, 2011. The body of a U.S. exchange student was found Tuesday in a river in Madrid, 10 days after he went missing following a night out, a police official said. The cause of death was not known but there were no immediate signs of foul play in the death of San Diego State University business student Austin Bice, who was 22, the National Police official said. (AP Photo/Paul White)

Larry Bice said Wednesday in Carlsbad, Calif., that he hopes Spanish authorities will provide answers soon.

Bice says he spent nearly a week searching for his 22-year-old son, Austin, near the Madrid nightclub where he was last seen. He says the river was across the street and was walled, and that friends told him his son was not drunk.

Bice says his son was a good swimmer and that there were ladders along the walls of the river.

Spanish police conducted an autopsy on the 22-year-old exchange student. They said there were no immediate signs of foul play.

Bice says he hasn't yet received results of the autopsy