Two army recruits and a civilian were killed on Sunday when an explosive targeting a security forces bus went off in Egypt’s al-Arish city.
Five other people were wounded in the attack.
Arish is located in Sinai, which has been a hotbed for extremists loyal to the ISIS terrorist organization.
Egyptian President Abdul Fattah al-Sisi had declared on January 19 that thousands of members of the security forces have been injured in extremist attacks since 2014.
Security sources said that hundreds of their members have been killed by the terrorists since the 2011 uprising.
The extremists have in recent months widened their attacks to target churches.
Hundreds of the terrorists have meanwhile been killed in security and military campaigns in northern Sinai as they seek to eliminate them from the area.