Two men were killed and two others wounded in separate shooting incidents in Washington late Friday night and early Saturday morning, D.C. police reported.

One, a 44-year-old Southeast man, was shot to death during a robbery attempt in the 3400 block of 21st Street SE at around 8 p.m. Friday, police said. Police declined to release the dead man's name until relatives could be notified.

The second man, identified by police as Clarence Bymum, 35, of 1619 R St. NW, was brought to Howard University Hospital by a private citizen and was dead on arrival around 2:45 a.m. yesterday. Investigators said they have not established a motive for the shooting.

No arrests have been made in either of the homicides, police said.

A 29-year-old man was taken to the Medstar unit of Washington Hospital Center after he was shot near 14th and U streets NW at around 2:30 a.m. Police said that Larry Jenkins, address unknown, had been pursued by a man and a woman who fired several shots at him. Jenkins was listed in critical condition last night. No motive for the shooting was known.

Ricardo Coates, whose address also was listed as unknown, was shot in his car at the corner of 10th and T streets NW early yesterday morning during an argument, police said. He was taken to Howard University Hospital, where he was listed in serious but stable condition.

The two deaths brought to 13 the number of slayings committed in the city in the first nine days of the new year. There were a total of 232 homicides in the city in 1981, police said.