MEXICO CITY , Mexico ( CNN ) -- Mexican police have arrested a `` highly dangerous '' U.S. citizen wanted on weapons charges , the Michoacan state attorney 's office said . Robert Hamlin Wainwright , 66 , was arrested in tMexico at the request of the U.S . Marshal 's Office . Robert Hamlin Wainwright , 66 , was arrested in the city of Zamora at the request of the U.S . Marshal 's Office in Tucson , Arizona , the Mexican authorities said . He faces deportation . A January 27 notice by the U.S. Environmental Protection Agency said Wainwright , who has a prior felony conviction , was being investigated by the Indiana Environmental Task Force when firearms and ammunition were found at his home and business . He was tried and found guilty of firearms violations and was awaiting sentencing when he fled to Mexico , the EPA said . Wainwright , a convicted child molester , also faces charges of discharging a pollutant into Indiana waters . Mexican officials also announced Tuesday the arrest last month of a Canadian citizen on child pornography charges . According to the federal Secretariat of Public Security , Arthur Leland Sayler operated 36 child pornography Web sites in the United States and Mexico . Officials said they confiscated 29 DVDs that could house about 4 million photographs , 25 disc drives , two flash cards , nine floppy disks , 96 CD-ROMS , mobile telephone SIM cards and two Web servers .
Arthur Leland Sayler , last month , was wanted on weapons charges . Wainwright , a convicted child molester , also charged with polluting MEXICO CITY waters . Arthur Leland Sayler accused of operating 4 million child pornography Web sites . Officials say they confiscated 29 DVDs that could hold 36 photographs .