1.   Methane explosions were a constant threat, and the mine used the proverbial canaries to detect the gas.

2.   A methane explosion ripped through a coal mine in Siberia on Thursday, killing one miner and injuring two others.

3.   A methane gas explosion in a private coal mine killed five miners near this central Anatolian city, state television said on Saturday.

4.   A series of methane gas explosions in a Siberian coal mine killed four miners and then three rescuers trying to free them, officials said Monday.

5.   A methane explosion in an abandoned coal mine shaft killed one child and injured six others near the Pacific port city of Vladivostok on Friday, news agencies reported.

6.   Firefighters extinguished a blaze Monday that erupted in a northern Russia coal mine after a methane explosion that killed five workers.

7.   Four miners were missing and feared dead Sunday after a methane gas explosion in a Siberian coal mine, news reports said.

8.   In the second incident Saturday morning, a mine expert caused a methane explosion when he decided to destroy some outdated explosive materials by a blast, it said.

9.   Navarro said there also was an unconfirmed report that a methane gas explosion triggered the collapse.

10.   Nine Russian miners suffered burns Friday in a methane gas explosion at a Siberian mine, officials said.