Washington, D.C ? The Justice Department’s internal watchdog on Friday faulted the FBI for sloppy work in mistakenly linking an Oregon lawyer, a Muslim convert, to the 2004 Madrid train bombings, but said the government did not misuse the anti-terror Patriot Act against him.

FBI fingerprint experts probably were more resistant to re-examining their conclusion that Brandon Mayfield’s fingerprint matched one on a bag containing detonators like those used in the attacks in Spain because of his religion, Inspector General Glenn Fine said in the executive summary of a 273-page report that otherwise remains classified.

Federal prosecutors and FBI agents also made inaccurate and ambiguous statements to a federal judge to get arrest and criminal search warrants against Mayfield, Fine said. The sworn statements submitted to U.S. District Judge Robert Jones apparently led him to believe that U.S. and Spanish fingerprint analysts agreed that the print on the bag was Mayfield’s, when in fact the Spaniards had raised questions about the identification, Fine said.