WASHINGTON (AFP) - Three imams including a US-born Muslim bound for a conference on Islamophobia were kicked off US domestic flights out of security fears, clerics and an airline said Saturday. Two imams boarded a flight from Memphis, Tennessee to Charlotte, North Carolina on Friday only to have it return to the terminal so they could be put through "additional screening," said a spokesman for Atlantic South Airlines, the Delta Connection airline operating the flight. "We take security and safety very seriously, and the event is currently under investigation," said spokesman Jarek Beem, adding that the men were put on the next available flight. ASA is investigating the incident, "and we sincerely apologise for any inconvenience that this may have caused," Beem said. US-born imam Al-Amin Abdul-Latif of Long Island was barred from boarding an American Airlines flight from New York to Charlotte late Friday and told to return to LaGuardia airport for a morning flight Saturday, only to be refused boarding again, without explanation, his son said. "This morning we get to the airline, and the ticket agent told my father that the airline does not want him to fly. Those were her exact words," Abu Bakr Abdul-Latif told AFP. "There was nothing he could do," said the son, who travelled on to the Charlotte conference without his father. Masudur Rahman, a permanent US resident from India and former Memphis imam who teaches Arabic at the University of Memphis, said he and another cleric, a US permanent resident from Egypt and dressed in a shoulder-to-ankle Islamic robe, were pulled off ASA flight 5452 and cleared through new security checks.