A Florida 9-year-old boy was arrested Monday after allegedly stabbing his 5-year-old sister multiple times, police say.

At about 4:20 p.m., officers responded to Berkeley Pointe Apartments in Ocala in response to a stabbing inside one of the units. That's where a 5-year-old victim was found with stab wounds.

Investigators said the boy told them he first thought about killing his sister two days earlier.

An affidavit states that the children's mother left them alone for about 10 minutes while she went to check the mail and get some candy for them from a neighbor in the complex.

She says when she came back she saw the boy stabbing his sister and grabbed the knife away from him. She took her daughter into the bathroom and the boy ran out of the apartment. He was later found hiding in a maintenance shed on the property.

Detectives say the 5-year-old was alert, able to communicate and air lifted to a nearby hospital for injuries. No updates on her condition were immediately available.

The 9-year-old boy is charged with Attempted First-Degree Murder.