D.C. police arrested suspects in two slayings in the city yesterday and were busy investigating three other shooting incidents that left three men critically wounded during a day of burglaries and street hold-ups.

Police arrested Keith L. Browning, 23, listed at 1460 Euclid St. NW, and a 16-year-old girl in connection with the slaying Monday of Cristobal Bonilla, identified by police as an illegal alien from El Salvador. Bonilla, 25, had been shot in the chest during a robbery, police said.

Police also arrested James Adell, 26, listed at 2345 Green St. SE, in connection with the execution-style slaying of a Southeast Washington man last September. Glenn Bailey, 30, was found last Sept. 8 on the railroad tracks at Firth Sterling Avenue SE with several bullets in his head.

D.C. Police homicide Capt. Jimmy Wilson said the Bailey killing was apparently drug-related. The District has recorded 217 homicides so far this year, compared to 192 at this time last year.

In the first of a series of shooting incidents yesterday, police said 67-year-old John Clifton was shot in the stomach by a burglar who had entered his home at 4633 East Capitol St. SE and tied Clifton up with wire coat hangers. Clifton is in serious condition at D.C. General Hospital. Police said they had made no arrests.

Next, a 22-year-old Haitian living here was shot in the chest during a robbery at a variety store at 1904 First St. NW, police said. The victim, identified as Jeane C. Cinada, was in serious condition at Washington Hospital Center after three hours of surgery. No arrests have been reported.

About an hour later, 24-year-old Thomas L. Boatwright, listed by police at 1222 Oates St. NE, was shot in the chest during a robbery in the 3600 block of Martin Luther King Avenue SE. Boatwright is in serious but stable condition at Greater Southeast Community Hospital.

Police arrested Mike Tillery, 24, and Angus Bostic, 24, both listed at 631 Raleigh St. SE, in connection with the Boatwright shooting.