Vladislav Miftakhov
© Altoona Police Department
Vladislav Miftakhov was being investigated for growing marijuana in his home when police found bomb-making materials.
The Russian roommate of a Penn State student who has been charged with building a suspected bomb in his bedroom has said that the 19-year-old recently set off three "mini-bombs" just outside their apartment.

Andrew Leff told the Altoona Mirror that he warned Vladislav Miftakhov to get rid of the bomb-making materials. He called Miftakhov "dumb" and "crazy", but not dangerous.

Miftakhov was in jail on Sunday in Altoona, after being arrested on Friday and charged with possessing a weapon of mass destruction, risking a catastrophe and other counts. Court records do not list a lawyer for Miftakhov.

Police said they were investigating a reported marijuana growing operation at Miftakhov's apartment when they found and dismantled the suspected bomb. They also allegedly found a suitcase containing explosives-related material.