we are learning tonight that russian authorities secretly recorded a phone call in 2011 betweebetween tamerlan tsarnaevd his mother. in the call, the two spoke about jihad. the u.s. government learned of the wiretap just within the last few days. elaine quijano has the latest on the investigation. >> reporter: authorities have ended their two-day search of a landfill 60 miles south of boston near where dzhokar tsarnaev attended college. sources say investigators were looking for laptop computers as they try to determine what shape the tsarnaev brothers' views. investigators believed the brothers were influenced by the online preachings of islamic radicals, include anwar al-awlaki. >> the simple answer is america cannot and will not win. >> reporter: the american-born cleric was a leader of al qaeda's affiliate iniemen and linked to multiple plots in the u.s., among them, the attempted underwear bombing of a detroit-bound airliner on christmas day.