Twenty-one Egyptian policemen were killed in a road accident Monday as their driver lost control of their truck in the Sinai, where security forces are battling Islamist militants, the interior ministry said.
Twenty-four policemen were injured in the accident near the border with Israel, it added in a statement.
The dead and injured conscripts belonged to the interior ministry's Central Security Forces, which along with the army has been battling Islamist militants behind a series of deadly attacks in the lawless peninsula.
In a separate incident, a policeman and a gunman were killed in a gunfight in the northern Sinai town of El-Arish during a foiled attempt to rob a postal vehicle carrying money, security officials said.
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They said the firefight was unrelated to militant attacks in the region that have targeted police and soldiers, including a brazen August 5 ambush on an army outpost that killed 16 soldiers.
The sparsely inhabited peninsula is home to the country's most lucrative beach resorts along the Red Sea, but has also become a hub for Islamist militants, drug traffickers and smugglers.
The military launched an unprecedented operation involving tanks and helicopters to quell the militants after the August 5 attack, which also led to the sacking of top military generals and the head of intelligence.
Security in the desert and mountainous region had collapsed after a January-February 2011 uprising that forced president Hosni Mubarak to step down.