A suburban man arrested after a police search found Molotov cocktails in his backpack was released on electronic monitoring — but taken into custody by U.S. Immigration and Customs Enforcement agents two days later. Hamed Alsaidi, 31, was arrested Aug. 1 after Mokena police officers searched him and found eight glass bottles filled with an ignitable liquid, with cloth stuffed into the bottle openings, according to Mokena Police Chief Brian Bento…