Ottawa: US security officials have apologised after a Sikh minister of Prime Minister Justin Trudeau’s Cabinet was asked to remove his turban at a US airport before boarding a flight last year. Minister of Innovation, Science and Economic Development Navdeep Bains said the incident happened at Detroit Metro Airport on his way back to Canada in April 2017. He said the airport staff had behaved inappropriately, SBS News reported on Friday. Bains said the security guards asked him to undergo special screening because of his turban, despite passing through the metal detector. But the test malfunctioned. That is when a security official asked him to remove his turban for inspection. Bains said he pushed back and asked them to do the test again during the April 2017 incident.