SUBANG JAYA, April 7 -- Inspector-General of Police Tan Sri Razarudin Husain said police are investigating potential criminal elements and a broader scope of negligence in their probe of the Putra Heights gas pipeline explosion.

At a press conference today, he said that more than 10 agencies are currently involved in investigating the disaster.

He said that negligence isn't always the sole factor - environmental conditions or system pressures could also contribute to what happened.

"There are many aspects of negligence. Negligence doesn't involve just humans. If there is ground movement below, and high pressure from water flow, and various other factors could also be the cause. That's what we discussed earlier," he said after a closed ...