Woman dead, man in serious condition following shooting in Roxbury this afternoon

A woman is dead and a man in serious condition after a shooting in Roxbury this afternoon, Boston police said.

The two, both believed to be in their 20s, were shot around 3:22 p.m. while sitting in a silver sedan on Walnut Avenue in Roxbury, Police Superintendent William B. Evans said at the scene.

Police are investigating whether that shooting is related to another in Roxbury this morning that left two men wounded.

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Evans said after the Walnut Avenue shooting, the wounded man drove to nearby Egleston Square and parked at the Mobil gas station at 3055 Washington St. The man was taken to Boston Medical Center in serious condition, Evans said. The woman was pronounced dead at the scene.

The identities of the victims were not released pending notification of their families.

Evans said police were searching for a dark-colored sport utility vehicle that left the scene on Walnut Avenue after shots were fired. Police did not have a license plate number for the SUV but were in the process of interviewing eyewitnesses to the shooting.

At 5:30 p.m. today, the Mobil station and a portion of Washington Street to its southeast were blocked off as officers investigated. Police were also on Walnut Street, which was partly closed to traffic.

Officer Katherine Shea, a police spokeswoman, said detectives were investigating whether the afternoon shooting was related to one near 249 Humboldt Ave. in Roxbury at 5:43 a.m. today.

Two men in their 20s, one of whom was in critical but stable condition, were being treated at Boston Medical Center.

Jeremy C. Fox can be reached at jeremy.fox@globe.com.