CAIRO, Nov 29 (Aswat Masriya) - The armed forces killed three "terrorists" during raids conducted from Wednesday to Friday in the Sinai Peninsula , its spokesman said on Saturday.

Armed forces spokesman Mohamed Samir said in a statement that the "terrorists" were killed in crossfire with security forces.

Security forces also arrested 21 people they accused of complicity in "terrorist plots" against armed forces and police personnel, Samir said, adding that they destroyed as well 70 "terrorists' headquarters".

Militants have stepped up attacks targeting security forces in Egypt, particularly in the Sinai Peninsula, since the army's ouster of Islamist President Mohamed Mursi in July 2013, which followed mass protests against his rule.

At least 30 military personnel were killed in a suicide blast which targeted a security checkpoint in Sinai's Sheikh Zuweid on October 24, in the worst militant attack since Mursi's ouster. 

Egypt's most dangerous militant group, the Sinai-based Ansar Bayt al-Maqdis, claimed responsibility for the attack in a video released on November 14, shortly after pledging allegiance to the leader of the Islamic State fighters in Iraq and Syria.

President Abdel Fattah al-Sisi declared a three-month state of emergency and a nighttime curfew in parts of the Sinai Peninsula in response to the attack.