The militants are now surrounded in the northwestern quarter including the historic Old City, using booby traps, sniper and mortar fire against the assailants.
Police on Sunday reported a toxic gas attack on its troops that caused no deaths. It also said the militants were increasingly using suicide motorbikes attacks.
The narrow alleyways restricts the use of suicide cars by the militants and tanks, armored personnel carriers and Humvees by the government forces.
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