HOUSTON – The Houston Police Department is investigating after two undercover officers were shot at while conducting surveillance on the city’s southside Tuesday night, police said. Police said the incident happened around 11:15 p.m. in the 3500 block of Lydia Street when officers were initially keeping watch at Spotts Park. The officers said they began following the vehicles while attempting to get a marked HPD unit for a traffic stop. The officers said they followed one of the vehicles to the area of Lydia and Springhill, where they eventually lost the vehicle. Officers said an AK-47 was located down the street from the intersection of Lydia and Springhill.