11.   The accident knocked the valve off at least one of three tanks containing the gases, allowing the contents to spew out, Sheriff David Naquin said.

12.   The dirt also removed a protective layer of foam that contained escaping gases.

13.   The gas was contained in an aerosol can of the type carried by people for self-defense, police said.

14.   The mammals probably had been dead for four or five days, because of one them was in an early stage of decomposition and contained gas.

15.   The tank, although empty, was believed to contain poisonous gas which could be fatal if inhaled without the use of an oxygen mask or special protection.

16.   They burned furniture and threatened to explode two metal barrels containing gas if police tried to intervene.

17.   He said the two sites were also believed to contain gas, but the amount was difficult to estimate.

18.   However, police experts said the gas leak could have come from underground storage tanks at the plaza that contained cooking gas.

19.   Oil extracted in the region comes from basins which also contain gas.

20.   Police earlier suspected the drums contained amonia gas.