San Francisco police asked Wednesday for the public's help in locating three assailants who attacked men they believed were gay in incidents in the Castro and Hayes Valley neighborhoods.

In both incidents, the three men approached the victims, who were alone, and punched them while yelling homophobic slurs, police said. Neither victim was seriously hurt.

Police are investigating the attacks as possible hate crimes.

The first happened March 29 at 2:30 a.m. on the 400 block of Castro Street, and the second on April 7 at 10:30 p.m. near Market and Gough streets.

The victims described one suspect as a clean-cut Latino with black hair, 6 feet tall and 170 pounds, between ages 25 and 30. The second suspect was described as a white or Latino of about the same age, 5 feet 7 and 150 pounds, with spiky blond hair. He was wearing a black puffy jacket and blue jeans.

The third suspect was described as a white or Latino between ages 25 to 30, 5 feet 10 and 150 pounds, with short blond hair. He was wearing blue jeans.

The victims said the men spoke with "an East Coast or foreign accent," according to police.

Although police know of only two attacks, they said the men may have committed other assaults.

"If this is a pattern, where these individuals are out there terrorizing a certain demographic of our city, we just want people to come forward," said police spokesman Officer Gordon Shyy.

Anyone with information is asked to call the police special investigations division at (415) 553-1133 or an anonymous tip line at (415) 575-4444, or text a tip to TIP411.