Three undercover police officers were injured, one critically, after their unmarked vehicle crashed into another car in North Philadelphia.

Details are sketchy, but at 2:36 p.m. the cars crashed near 18th St. and Windrim Ave. in the city's Logan section. The officers' vehicle then crashed into a pole, police said.

Officer Ray Hein, critical after suffering head trauma and a broken leg, was rushed to Albert Einstein Medical Center. He is expected to make a full recovery said Dep. Commissioner Wright. Another officer is in guarded condition with a broken leg, the third is stable. They were expected to be released from the hospital tonight.

The operator of the other car was also taken to Einstein with non-life threatening injuries.

Officer Hein, 40, is a 12-year veteran of the police force, a spokeswoman said.

Contact staff writer Sam Wood at 215-854-2796 or samwood@phillynews.com.