By LESLIE MILLER BOSTON (AP) - Twenty people working at Logan International Airport were charged with lying to get their jobs or security badges. Samantha Martin, U.S. Attorney Michael J. Sullivan's spokeswoman, said 15 people were taken into custody in a sweep Wednesday morning. Five more workers were expected to be in custody by the afternoon. Sullivan scheduled a news conference for Wednesday afternoon to announce details of the charges, which are part of an ongoing investigation to improve airport safety. The employees work for private companies at Logan, not the airport itself. Each of the workers was being brought into U.S. District Court for an initial appearance, but as of early afternoon the court had released the complaint against only one worker, Edgar B. Argueta. He was ordered held pending a detention hearing. Argueta, 28, originally from El Salvador, was accused of using a fake alien registration card and a fraudulent Social Security number on his Jan. 12, 2001, application as a cleaner employed by Precision Cleaning Co. The company did not immediately return a call for comment. In December, 271 workers at Salt Lake City International Airport were fired after a federal investigation dubbed "Operation Safe Travel" revealed they'd lied to get their jobs and badges. A similar sweep also was done at the Las Vegas airport. Arrests of smaller groups or of inidividuals have happened at other airports. The ongoing review was sparked by a Social Security and Immigration and Naturalization Service audit that found a high number of airport laborers were using invalid numbers. Security at Logan has been particularly in the spotlight because the two hijacked planes that destroyed the World Trade Center on Sept. 11 took off from there. "This federal involvement strengthens the ability of airports around the country to weed out individuals that have misled the federal government," said Jose Juves, spokesman for the Massachusetts Port Authority, which runs Logan. State police have been conducting background checks of employees of businesses that operate at Logan since 1987, Juves said. "We did the maximum check permissible under the law with information made available to Massport," he said. Hundreds of people have been denied jobs because of the checks, which include a Massachusetts criminal history check and check of outstanding warrants, he said. Martin said all 20 workers were expected to have initial appearances in U.S. District Court on Wednesday afternoon.