Continued from page 1

“The incidents are still being investigated, but the last word I heard was that there was no information that definitively linked anything,” said Officer Junis Fletcher, a police spokesman.

The killings put the District’s total for the year at 72, compared to 67 killings at the same time last year. The District recorded 181 killings last year - far below the peak total of 479 killings logged in 1991 but the first increase since 2002.

Mr. Fenty, a Democrat, said the killings represent an “unbelievably high level of violent crime to take place in a short period of time.”

But such crime has become more familiar this year in the Fifth District, which has fueled the city’s modest increase in homicides, accounting for nearly one in three killings in the city this year.

Mr. Fenty and police officials in April pledged to target high-crime areas and double the number of officers on patrol in the district in response to the violence after five persons were killed in four days.