Investigators in white hazmat suits are searching a landfill for a laptop tied to the accused Boston Marathon bombers, a potential lead that emerged as a result of interviews with two men from Kazakhstan who knew the terror suspects, law enforcement sources told ABC News.

Immigration officers arrested the two men, Dias Kadyrbayev, 19, and Azamat Tazhayakov, 20, on Saturday on suspicion that they had violated the terms of their student visas because they were no longer attending classes. They are being detained on the administrative charges at the Suffolk County (Mass.) House of Corrections. …

It was through the Kazakhstani men that investigators learned of the possible whereabouts of Tamerlan Tsarnaev’s laptop and authorities have been searching the New Bedford landfill for the past three days, the police sources told ABC News. And, the sources said, agents found a cell phone believed to belong to Tamerlan Tsarnaev’s in the New Bedford apartment.