Police in Philadelphia have released surveillance video of a hammer-wielding man attacking another man dozing in a subway car.

The video shows the attacker boarding the subway just after midnight on Thursday with a young child about 5 years old.

Detective Kenneth Roach says it appears that the man kissed the child, then told him to sit down.

After that, the man reached into a backpack he was carrying, pulled out a hammer and began attacking another man who was sitting nearby and dozing off.

The attack spilled onto the subway platform and lasted for several minutes.

Roach says the victim escaped with relatively minor injuries from what appears to have been an unprovoked attack.

No arrests have been made.

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