The assault happened in a home on the 1600 block of Kalorama Road NW about 3 a.m. Tuesday. The block includes the Adams Morgan Harris Teeter grocery store.
The attacker was arguing with the victim about a guest staying at their place when the assailant came at him with a knife and then a paint scraper, injuring him, according to authorities.
The victim tried to use a mattress to shield himself. But his roommate stabbed around and through it with the knife.
The assailant eventually left, after changing his clothes.
The victim was brought to a local hospital for treatment.
Police haven’t released a suspect description.
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