January 18, 2014 - 4:52PM A Sydney man accused of posing as a teenage girl to lure boys into performing sex acts via webcam, before threatening to share the images, will face charges in the US. Police arrested Mark Anthony Warren, 48, at his Neutral Bay home on Thursday after a joint Australian investigation with the FBI. He was charged with using a carriage service for sexual activity with a person under 16 years, using a carriage service for child pornography material and possessing child abuse material. The FBI confirmed on Saturday Mr Warren had been charged with production and receipt of child pornography and extortion. Between November and December last year, Mr Warren used fake social media accounts to pose as teenage girls and a teenage boy and engaged boys in sexually explicit conversations, authorities allege. He reportedly showed the boys a pornographic video of the woman he claimed to be and recorded the children performing sex acts. Mr Warren threatened to share the videos online and show them to their families and friends if they did not perform more sex acts and upload them to a website he created, authorities said. He allegedly provided his victims with instructions about making the videos. He also told them they would be charged with child pornography offences if they went to the police, authorities said. One of the alleged victims was a 14-year-old boy from New York, who told his parents. They raised the alarm. Mr Warren was granted conditional bail to appear at the Downing Centre Local Court on February 13.