Two police officers were killed Monday while trying to detonate bombs found outside the Egyptian Presidential Palace, the interior ministry said.

Three bombs were found outside the palace in Cairo.

One officer died and three were wounded when one of the bombs exploded. A second officer died trying to defuse another bomb. That explosion injured several others, the ministry said.

The third bomb was successfully defused, Egypt’s state-run new organization Al-Ahram reported.

Authorities do not know who placed the devices.

Last week, a series of small blasts hit metro stations and a courthouse in Cairo, injuring several people.

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