Residents return home after Calif pipeline blowout

Returning residents were wearing wristbands that show police they live in the area.

California regulators ordered the utility, Pacific Gas and Electric, to survey all its natural gas lines in the state in hopes of heading off another disaster.

Local and federal officials are probing the cause of the explosion that blew a segment of pipe 28 feet long onto the street some 100 feet away, creating a crater 167 feet long and 26 feet wide.

Investigators still don't know what caused Thursday night's blast. Investigators believed they had collected all the sections needed to reconstruct the metal pipeline but asked that anyone who found metal fragments in the blast area contact the NTSB. The agency also wants to know of any instances of dead vegetation prior to the explosion, which could indicate a gas leak.

At a church service at St. Robert's Catholic Church on Sunday morning, the Rev. Vincent Ring conducted a prayer for the people who died, as well as a prayer for the victims who have not been identified.

"We turn to God and we ask for mercy upon all our brothers who are hurting so badly, whose lives have changed so drastically and whose help is so badly need from us," Ring said. (quote from http://news.yahoo.com/s/ap/us_large_explosion)