* Wave of attacks in Sinai
* Army has launched campaign to rid region of militants
CAIRO, Oct 19 (Reuters) - At least four soldiers were wounded on Saturday when a car bomb exploded near an army intelligence building in Ismailia, northeast of Cairo, security sources and state media said.
The sources said another undetonated car bomb was found while security personnel were sweeping the area. The force of the blast caused part of the military intelligence building's wall to collapse, one of the sources said.
A surge in violence against army and police forces has hit the largely lawless Sinai peninsula, adjoining the Palestinian Gaza strip and Israel.
Militants mostly based in North Sinai have escalated attacks on security targets since July 3, when the army deposed President Mohamed Mursi of the Muslim Brotherhood and installed a new government in response to mass protests against his rule.
The Brotherhood, now outlawed in Egypt, called his ouster a coup, whereas the army says it was responding to the will of the people. Security forces have killed hundreds of the movement's supporters since August, when they crushed two protest camps.
The Egyptian army launched a large military operation in Sinai in September to clear it of armed militants, seizing weapons including anti-aircraft missiles and hand grenades.