ISLAMABAD: The United States on Saturday called for immediate release of the US citizen Raymond Davis, allegedly involved in killing of two local citizens in Lahore, saying he was being nlawfully detained by authorities, according to US embassy in Islamabad. “When detained, the US diplomat identified himself to police as a diplomat and repeatedly requested immunity under the Vienna Convention on Diplomatic Relations,” it said in a statement. It added, “Local police and senior authorities failed to observe their legal obligation to verify his status with either the US consulate general in Lahore or the US embassy in Islamabad”.