A San Francisco police spokesperson said an assault happened near Market and Battery streets just before 8 a.m., but did not give details about the attack.
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Around the same time, police received reports of a stabbing near 4th and Market just a half-mile away.
SFPD says three people were stabbed.
MORE: 1 woman dead, multiple victims stabbed after group of attacks in Berkeley, police say
1 woman dead, multiple victims stabbed after group of attacks in Berkeley, police say
Officers detained a man at that scene.
Police believe he's a suspect in both attacks.
All four people were taken to the hospital.
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There is no word on their condition
Anyone with information is asked to contact SFPD at 415-575-4444 or text a tip to TIP411 and begin the message with SFPD.
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