Police are searching for a man who walked into an unlocked Philadelphia home and shot a man in the head before fleeing on foot.

Around 10:30 p.m. on Wednesday on the 1800 block of Fillmore Street in Frankford, a gunman walked through the front door of a home and opened fire inside, hitting a visitor in the head, NBC reported. The victim, 30, was pronounced dead on the living room floor.

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Besides the victim, the home also contained 12 people, including four children, at the time of the shooting, ABC reported in a related article.

"We don't know a motive. However, the intersection of Tackawanna and Fillmore streets is known for street-level narcotic sales. So in addition to having numerous witnesses that were inside the house, we have numerous cameras right outside," Chief Inspector Scott Small said to ABC.

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The suspect, wearing a dark colored jacket, fled on foot, running east on Fillmore towards Tackawanna Street, according to ABC.