By Al Novack

PHILADELPHIA (CBS) – A violent day in Philadelphia Tuesday continued well after the sun went down.

An 18-year-old bicyclist was shot and killed around 11pm at the corner of 54th and Chestnut Streets in West Philadelphia. Police say the victim was dead on arrival at the hospital.

Two hours later, another 18-year-old man who was being chased by a group of men near 34th and Wallace Streets in West Philadelphia’s Mantua section was shot in the head. Police say the victim remains in very critical condition paralyzed from the neck down.

No names have been released and no arrests have been made in either incident.

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