Police were investigating two separate stabbings that occurred early Saturday in West Philadelphia - one that left a man in critical condition, and another in which a woman allegedly stabbed and injured her husband, who was in stable condition.

Officers responded to the critical stabbing at 12:52 a.m. outside on the 4600 block of Lancaster Avenue in which a 68-year-old man was slashed across the throat, police said. He was taken by medics to Penn Presbyterian Medical Center. Police said no weapon was recovered and no arrest has been made in this case.

About four minutes after that stabbing, police responded to another on the 5800 block of Delancey Street. There, they found a 48-year-old man outside, stabbed once in the lower back by his wife, police said.

The husband was taken by medics to Penn Presbyterian in stable condition. Police said no weapon was recovered, but the woman, whose name was not released, was arrested.

Two separate shootings around midnight in Kensington and North Philadelphia also left two victims in stable condition, police said.

About 11:30 p.m. Friday, police found a 52-year-old man shot twice in the upper right arm and once in the left thigh on the 3500 block of Braddock Street in Kensington. The victim, who was taken by police to Temple University Hospital in stable condition, was shot during a robbery, police said.

Then, about 12:12 a.m. Saturday, police said, a 22-year-old man was shot once in the arm at 24th Street and Ridge Avenue in North Philadelphia. This victim was taken by a private vehicle to Hahnemann University Hospital, where he was in stable condition.

No arrests were made and no weapons were recovered in either shooting.