PHILADELPHIA (CBS)–Philadelphia police have charged an 18-year-old man in the attempted homicide of his 7-year-old sister, a captain with the city’s special victim’s unit confirmed at a news conference late Wednesday.

Simere Alford allegedly strangled his younger sister before placing a bag over her head. Investigators say Alford was possibly high on what’s known as K2.

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“We heard screaming and we came out, and the cops were giving the little girl CPR,” said neighbor Kathy Burgos. “And after that I know they took her to the hospital.”

Police were called to the 5500 block of North American Street just before 1 a.m. for reports of a stolen car.

The woman who reported the theft claimed her son demanded the keys and took off. Police say when they arrived, the woman gave a statement to police and went back inside her home to look for the vehicle registration. That’s when she discovered her daughter, who was unconscious on the basement floor.

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Alford, whom it’s alleged crashed his mother’s car three blocks away, surrendered, police say, when he got into an unlocked patrol unit outside the 35th District. The doors locked once he got inside. Police say he then told them he had done something terrible.

Simere Alford

The victim, whom police successfully revived at the scene, remains on life support at St. Christopher’s Hospital.