Police responded to several stabbings that occurred within an hour of each other overnight in SoMa and Tenderloin.
The first stabbing occurred just before midnight in the area of 8th and Mission streets, when a 39-year-old man was approached by another man who claimed he owed him money, police said.
The 30-year-old suspect stabbed the victim in the left arm with a pocket knife and then ran away.
Around 12:40am, a man was stabbed by a woman in his apartment in the 300 block of Ellis Street.
The 30-year-old woman had been visiting the man's apartment, but the man tried to call 911 after he saw her apparently searching for things to steal.
The woman allegedly stabbed the man in the shoulder before fleeing.
Less than 15 minutes later at 7th and Folsom Streets, a 37-year-old man was stabbed during an argument on the street with a woman and a man.
All three victims were taken to the hospital with injuries that were not thought to be life threatening.
An arrest was made in the incident at 7th and Folsom, but police are still searching for suspects in the other two attacks.