A fire that tore through a Yonkers apartment building Sunday, injuring six people and leaving 28 homeless, has been classified as an arson based on evidence gathered at the scene, police said.

"We have made no arrests," Det. Lt. Patrick McCormack said Thursday. "Detectives do have a few leads and are following up on them."

McCormack declined to give further details, citing the ongoing investigation.

Police had said that the four-alarm fire at 103 Webster Ave. in the city's east end was "suspicious."

The fire destroyed the three-story apartment building at 103 Webster Ave., which was torn down Wednesday. Debris from the building was carted away Thursday, said Yonkers spokeswoman Christina Gilmartin.

Meanwhile, demolition work began Thursday on neighboring 105 Webster Ave., another apartment building, and should be completed by this weekend, according to Gilmartin.

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"Hopefully by Saturday, we'll have two clean lots," she said.

The blaze, reported at 3:38 p.m. Sunday, required more than 60 firefighters to put down. Four residents were treated for smoke inhalation and minor injuries, and two firefighters were slightly hurt. About 10 family pets were reported killed. And besides 105 Webster Ave., three other surrounding buildings were also damaged.

The 28 displaced people have all found places to stay, the Red Cross said.