Story highlights
Fifteen others are injured
The workers were headed to a factory
In a separate attack, one person dies in a police station shooting
CNN
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An attack on a bus carrying workers left three dead and 15 injured Monday in Egypt, health officials said.
A terror group attacked as the workers headed to a cement factory in northern Sinai, the military said in a statement. The rocket-propelled grenade was aimed at a police car, but missed and hit the bus, the statement said.
In a separate incident, one person died in a shooting on a police station under construction in central Sinai.