Authorities are searching for a man suspected in two indecent assaults that occurred within 15 minutes of each other in Dorchester.

On Wednesday morning around 6:15 a.m., a woman walking near the corner of Columbia Road and Richfield Street told police that a man approached her from behind and groped her before running away.

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About 15 minutes later, a victim near the same corner said she had been grabbed by a similar suspect who fled in the direction of Olney Street, police said.

The individual was described by police as a black man in his mid-20s who was approximately 5-foot-8 to 5-foot-10 and last seen wearing a black hoodie, black sweat pants and red and white sneakers.

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The Boston Police Sexual Assault Unit is investigating both incidents, and anyone with information should call detectives at 617-343-4400.