SYDNEY - The head of Australia’s domestic spy agency said he was seeking more recruits from new migrant communities, particularly among Muslims, to combat the dangers of an attack on home soil. David Irvine, chief of the Australian Security Intelligence Organisation, said there was a “real and persistent threat” of a local extremist attack, with a “worrying trend of home-grown terrorism.” There had been 3 major plots foiled in the past decade which “would have been the work of home-grown groups, with little or no direct contact with Al-Qaeda”, with 23 convictions for extremist crimes.