Gaza Strip, Aug. 28 -- Two explosions ripped through police checkpoints in Gaza City late Tuesday, killing three policemen and wounding two passerby, Hamas officials said.

Hamas' interior ministry said two deaths occurred after the first explosion.

Scarcely an hour later, a second blast occurred across town on a main coastal road, killing another officer. There, blood stains covered the road and debris from a damaged law enforcement trailer was scattered about. Police were deployed heavily in the area, blocking the street and directing traffic as ambulances arrived on the scene to take the body away.

It wasn't immediately clear who was responsible for the attacks.

But the deadly blasts are reminiscent of previous bloody rounds of infi...