SAN FRANCISCO (CBS SF) — An on-duty San Francisco motorcycle police officer was among the people injured in a multi-vehicle collision at Market and 8th streets late Wednesday morning, authorities said.

According to SFPD, at approximately 11 a.m., a vehicle collision occurred at the intersection of Market and 8th involving several vehicles including an officer on a motorcycle.

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The SFPD Twitter account posted about the incident shortly after it happened, asking people to avoid the area.

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Police said four people including the officer were injured and were transported to the hospital. Their condition was unknown as of early Wednesday afternoon.

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The police officer suffered non-life-threatening injuries, according to SFPD.