An spate of gunfire and stabbings in scattered parts of the District that began late Wednesday included at least two incidents that might have been related in Southeast Washington, where two men were killed and two wounded in shootings that occurred a few blocks apart, police said.

In all, seven people were shot, three fatally, and three were stabbed in six incidents from 9:15 p.m. Wednesday to 12:45 a.m. Thursday, police said. The two incidents that were possibly related occurred about 10 and 11 p.m. in Washington Highlands, near the city’s southern tip, a police commander said.

There, in the 900 block of Wahler Place SE, two men were gunned down in the street about 10 p.m. “Both are still alive,” Cmdr. Joel Maupin said late Thursday. “One was shot in the head; he’s in critical condition. The other was shot in the torso.”

That double shooting, and another that soon followed nearby, occurred in the police department’s most dangerous precinct, the 7th District, or 7D.

“It’s getting warm,” said Maupin, the 7D commander. “When the weather gets like this, we have more people hanging out, and there’s more activity on the streets, and more chances for disputes and violence, unfortunately.”

About an hour after the Wahler Place attack, two men were killed in the 700 block of Yuma Street SE, just three blocks to the west. Police identified the victims as Joshua Ruffin, 20, who lived on nearby Condon Terrace, and Reginald Williams, 22, of Adams Street NE.

“We’re trying to determine whether it was retaliation for the earlier incident or a spillover from it, a continuation,” Maupin said. “We’re out there trying to get any information we can on what might have led to all of this.”

Two law enforcement sources said they thought the people involved in the shootings at Yuma Street and Wahler Place were acquaintances. The sources declined to be named because the investigation is ongoing.

Another person, a 16-year-old male, was fatally shot Thursday night in 7D. He had been shot multiple times on the steps of an apartment complex in the 1300 block of Congress Street SE and was pronounced dead at a hospital, Maupin said. It was not immediately known whether the shooting, about one mile from Wednesday’s violence, was an act of retaliation.

Wednesday evening’s violence began when two men were shot, possibly by two suspects, about 9:15 in the 1200 block of Brentwood Road NE, just north of Gallaudet University, police said. They said that neither victim suffered life-threatening wounds. The double shooting was under investigation Thursday.

About a half-hour later and four miles west, a 22-year-old man was fatally shot behind his residence in the 700 block of Quincy Street NW, near the Georgia Avenue-Petworth Metro station, police said. They identified him as Shonell Corriea. Homicide detectives were investigating his killing.

“We have no information to indicate this is gang/crew related,” Cmdr. Kimberly Chisley-Missouri of the 4th District said in a community e-mail. “We are working with Homicide Investigators and continue to gather information on this crime. Patrol Officers are aware and are focusing in the Petworth area.”

The three fatal shootings Wednesday night brought the city’s 2011 homicide toll to 26, matching the year-to-date total as of last April 7, police said.

About 10 p.m., around the time the shootings were beginning in Washington Highlands, officers found a man who had been stabbed in the 1700 block of H Street NE, just east of the Trinidad neighborhood. He was hospitalized in stable condition.

Then, not far from that stabbing scene, two men were stabbed in the 1300 block of Trinidad Avenue NW about 12:45 a.m. Thursday, police said. Neither victim suffered a life-threatening wound. Officers said they found no evidence that those stabbings were related to the stabbing on H Street.

As of late Thursday, the incidents had resulted in one arrest. Police said Edward Morgan, 31, of Silver Spring was charged with assault with a dangerous weapon in the Trinidad Avenue stabbings.

Staff writer Clarence Williams contributed to this report.