Four Houston police officers have been shot and another injured while serving a search warrant at a home where heroin was believed to be sold. Police chief Art Acevedo confirmed two suspects were killed at the scene in southeast Houston during a shootout between the gunmen and officers which began around 5pm Monday. Two of the officers, ages 40 and 54, are currently in surgery and in critical condition after being struck in the neck, while the other three are stable. As of 7.30pm local time, police said the scene was secure.