initial check show takata corp 7312.t air bag part material involve deadly explosion truck texas last week ship properly u.s. regulator say wednesday spokesman national transportation safety board say agency hazardous material team make determination along federal motor carrier safety administration conduct initial survey ship document ntsb say decide next weeks whether deep investigation need incident occur aug. 22 near quemado texas leave one woman dead four people injure .. probe call early wednesday two u.s. senators richard blumenthal edward markey democrats members senate committee commerce science transportation ntsb say statement ask review document relate incident initial indicators materials package properly review document information show cause investigate ntsb say statement takata air bag inflators contain ammonium nitrate link least 14 deaths 150 injuries result large vehicle recall history prolong exposure defective takata inflators hot humid condition find cause air bag explode excessive force spray shrapnel passenger compartments ntsb must investigate incident determine whether company take appropriate precautions say statement senators democrats senators note ammonium nitrate also use agricultural fertilizers explosive construction mine industries say want protect future incidents highway shipments chemical compound also seek answer step must take ensure towns communities endanger shipment ammonium nitrate highways say ntsb independent safety investigation agency focus study accidents determine lessons learn could lead increase safety texas department public safety also investigate incident ntsb say stand assist texas officials upon request takata part involve blast ship properly ntsb