Pakistani investigators on August 7 were set to begin a probe to determine the cause of a deadly train crash, officials said. Several carriages of the Hazara Express derailed in the southern province of Sindh on August 6, killing 31 passengers and injuring nearly 100 others, Railways Minister Khawaja Saad Rafiq said. The minister said sabotage could not be ruled out. A rescue operation to remove the rubble and restore the track for passenger and freight traffic was still continuing nearly 24 hours after the crash, local rescue official Khursheed Panwar said.