It started as an attempt to serve a search warrant at a suspected drug house and quickly turned into a gun battle that killed two suspects and injured five officers, including four who were shot, Houston's police chief said. The suspects were killed Monday after firing at narcotics officers who were trying to enter a home on the city's southeast side where authorities allege black tar heroin was being sold, Chief Art Acevedo said. Four of the officers were shot and a fifth suffered a knee injury. Acevedo said two of the officers who were shot were hit in the neck by gunfire and were in critical but stable condition at a Houston hospital. "We're hopeful that they will recover," Acevedo said. Two other officers, including the one who injured a knee, were in good condition at the hospital Monday night. Another officer who was shot was released after being treated for a shoulder wound.