SYDNEY: Australian police Sunday released a second man arrested during counter-terrorism raids, days after two others were charged with terrorism offenses over an alleged plot to bring down a plane. The 39-year-old man, named by his lawyer as Khaled Merhi, was among the four arrested during raids across Sydney last Saturday, which also led to tightened security at all major Australian airports. “This investigation remains ongoing,” Australian Federal Police and New South Wales state police said in a statement. “A 39-year-old man, detained in relation to allegations regarding a potential terrorist attack, has been charged with one count of possession of prohibited weapon and released from police custody.” Merhi, whose detention by police had been extended by a magistrate, was due to be released Sunday if he was not charged. He is set to appear in court on the prohibited weapon charge on August 24. Two other men—Khaled Khayat, 49, and Mahmoud Khayat, 32—were charged with terrorism offences and refused bail Friday. Another man, 50-year-old Adbul Merhi, was released without charge Wednesday.