| http://www.w3.org/ns/prov#value | - The water main was installed in 1897, according to the city.Authorities also hoped to reach the basement - still under rubble - to examine heating units, meters and other equipment that might hold clues to the blast, fire department Commissioner Salvatore Cassano said.Mayor Bill de Blasio said: We can only get conclusive evidence when the fire is out, when the rescue is completed, and we really g
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