Suspected Tamil Tigers on Tuesday hurled hand grenades at a police vehicle in a crowded market in the army-controlled northern town of Vavuniya , killing at least two policemen .
<response> Suspected <misc>Tamil</misc> <organization>Tigers</organization> on Tuesday hurled hand grenades at a police vehicle in a crowded market in the army-controlled northern town of <location>Vavuniya</location> , killing at least two policemen . </response>