The American security contractor Blackwater USA has been involved in a far higher rate of shootings while guarding American diplomats in Iraq than other security firms providing similar services to the State Department, according to Bush administration officials and industry officials. Blackwater is now the focus of investigations in both Baghdad and Washington over a Sept. 16 shooting in which at least 11 Iraqis were killed. Beyond that episode, the company has been involved in cases in which its personnel fired weapons...at least twice as often per convoy mission as security guards working for other American security firms, the officials said...In addition to the Sept. 16 shooting...Iraqi officials said Blackwater employees had been involved in six other episodes under investigation. Those episodes left a total of 10 Iraqis dead and 15 wounded, they said...No Blackwater employees, or any other contractors, have been charged with crimes related to the shootings...[also refers to DynCorp International, Triple Canopy]