1.   All day, investigators sifted through the debris to check eyewitness reports that the fire was caused by either an electrical short circuit or a gas cylinder explosion.

2.   The arrests followed three days of clashes between protesters and police, arson attacks on schools, houses and cars and gas cylinder explosions.

3.   Two people were killed and two were badly injured Wednesday in an oxygen cylinder explosion in downtown Tbilisi, the Georgian capital, officials said.

4.   Bahrainis and foreigners living here are expressing growing fears about political unrest following a spate of bombings, gas cylinder explosions and arson attacks.

5.   Most probably it should be due to an electric short circuit or due to a gas cylinder explosion.