SAN FRANCISCO (BCN) — A man was left with critical injuries on New Year’s Eve after an assault in San Francisco’s Tenderloin neighborhood, police said.

Officers responded to the assault on Friday around 9:40 a.m. in the 200 block of Leavenworth Street.

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There, they learned the victim, a 55-year-old man, got into an argument with the suspect. At some point, the suspect shoved the victim to the ground, causing him to hit his head, according to police.

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The victim was transported to the hospital for his life-threatening injuries.

Officers were unable to locate the suspect and haven’t made any arrests in the case, police said.

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Anyone with information about the assault is being asked to call the Police Department’s tip line at (415) 575-4444 or to send a tip by text message to TIP411 with “SFPD” at the start of the message.