A man was shot and killed Saturday afternoon in the Shaw neighborhood in Northwest Washington, a few blocks from where three people were shot and wounded Tuesday night.

The victim was identified by police as Matthew C. Shlonsky, 23, of Northeast. Online information indicated that he was a member of the class of 2014 at American University and was on the honor roll.

Shlonsky, who grew up in the Cleveland area and played ice hockey, was killed just before 5 p.m. at Seventh and S streets NW, near the Shaw-Howard University Metro station.

An 2013 intern in the office of Sen. Rob Portman (R-Ohio), Shlonsky was the author of a 2014 paper on the proposed Trans-Pacific Partnership trade agreement. There was no indication that he was the intended target of the startling flurry of late afternoon gunfire in Shaw.

He died in the day’s second homicide.

“It’s in­cred­ibly tragic and in­cred­ibly frustrating,” said D.C. Council member Charles Allen, (D-Ward 6).

Police said they were looking for a burgundy Chrysler 300 in connection with the late afternoon slaying.

The vehicle, equipped with a sunroof, was seen leaving the area of the shooting, police said.

Saturday’s killing occurred four days after the Tuesday night triple shooting a few blocks to the south at Seventh and O streets NW. In an earlier incident near Seventh and O, a woman was fatally shot there on Memorial Day. She was identified as Tamara Gliss, a mother who was killed during a cookout.

In an effort to curb the violence, which has put Shaw residents on edge, the police department’s 3rd District set up a special, around-the -clock post last week at the Tuesday shooting scene.

Saturday’s shooting threw the surrounding area into tumult. A woman who was in a nearby bank branch said she heard about six shots. People ducked for cover.

“It was a lot of chaos,” the woman said, “which is why I stayed in the bank.”

The S Street entrance to the nearby Metro station was closed while police investigated.

Saturday’s slaying came amid not only a surge of violence in the Shaw area, but also a sharp increase in the homicide rate throughout the city.

The day’s earlier homicide occurred about 1 a.m. in the 1500 block of First Street NW, about a mile to the southeast.

The victim was identified as Lawrence Alonzo Carter, 27, of Northwest. No motive in the killing could be learned, and no information about him was immediately available.

The killings of Carter and of Shlonsky brought the District’s homicide total this year to 93, according to police figures. The number is 12 fewer than in all of last year.

Elizabeth Koh contributed to this report.