A police van carrying Aaftab Amin Poonawala -- accused of the horrific murder of girlfriend Shraddha Walkar in Delhi -- was attacked by a group of sword-wielding men last evening. The police managed to control the situation and Poonawala is safe, sources said. Sources said the police van was taking Poonawala back to jail from west Delhi's Forensic Science Laboratory, after his second polygraph test. The attack took place outside the FSL building.