A Central Massachusetts man was arrested Thursday after police discovered nine explosive devices in his car during a planned traffic stop, authorities said.

Police had begun investigating the man, Jason E. Baldarelli, Jr., 27, of Princeton, after a witness reported explosions near his Wheeler Road home, according to the Princeton Police Department .

The witness called police to the area around 4 a.m. Monday. During an initial investigation, Princeton Police Officer Douglas Costa identified Baldarelli as the suspected source of the explosions, the department said.

Costa and the Worcester County District Attorney’s Office obtained a search warrant as part of the investigation this week, which also involved the Massachusetts State Police Bomb Squad, state Joint Terrorism Task Force, stat

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