ISLAMABAD The US Embassy Thursday refused to disclose the identities of the two Americans who died in the plane crash in the Margalla Hills on Wednesday. Under the US law, I can not disclose the identities of the US citizens. We are working with the Pakistani authorities to iden-tify the remains of the two Americans, Embassys spokesman informed TheNation Thursday. The two Americans, a male and a female, are believed to have been associated with the noto-rious US private contractor XE Worldwide, formerly known as Blackwater and were operating in Pakistan and Afghanistan.