SAN FRANCISCO (CBS SF) — A man suffered head injuries when he was attacked Monday night in San Francisco’s Sunset District, police said.

The 52-year-old victim was taking out trash in the 1400 block of Seventh Avenue shortly after 8:30 p.m. when he was approached by two men in his 50s who he knew, police said.

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One of the suspects talked to him while the second suspect allegedly struck the victim repeatedly in the head with a weapon, possibly a crowbar, according to police.

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The victim was taken to the hospital with a head injury but is expected to survive.

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The suspects, who police said were driving a smaller four-door blue sedan, had not been arrested as of Tuesday morning.