31.   Army bulldozers continued to knock down buildings, sending up clouds of dust.

32.   At Tulokan, Mohammad Quasim tugged at his beard as the wind picked up, sending clouds of sand swirling through the flimsy tents.

33.   But health officials worried that a mistake could send a cloud of the gas for miles.

34.   Experts long have feared that parts of the ramshackle shelter could crash onto the ruins of the reactor, sending a cloud of radioactive dust into the atmosphere.

35.   Experts fear that parts of the ramshackle shelter could crash onto the ruins of the reactor, sending a cloud of radioactive dust into the atmosphere.

36.   Forest fires sent clouds of smoke billowing over the capital of Honduras, forcing closure of the international airport Wednesday.

37.   In some areas, walls of flame burned to the edge of beaches, sending massive clouds of black smoke into the air.

38.   Indonesia should prosecute timber companies blamed for the fires that are destroying huge tracts of rainforest and sending smog clouds billowing across southeast Asia, Greenpeace said Tuesday.

39.   Lava apparently ignited fumes of gasoline and diesel fuel at the station, detonating a series of massive fireballs that sent a cloud of jet-black smoke into the sky.

40.   Mortars ignited fires in a field that continued to burn Monday, sending clouds of smoke throughout the region.