moscow least two people die two injure thursday part nine-storey build collapse russian city izhevsk emergencies ministry official say apparent gas explosion official say still people trap debris build izhevsk 1,220 km 760 miles east moscow host plant manufacture famed kalashnikov assault rifle russia investigation committee say natural gas blast appear cause build collapse several similar accidents across russia recent years due poor safety record gas usage include southern russian city volgograd december 2015 least five people die two dead russian apartment collapse apparent gas blast