A wheelchair-bound suspect was being quizzed Wednesday over a chilling campaign to plant homemade bombs across East Texas, the Tyler Paper reported.
More than 30 pipe bombs and Molotov cocktail-style explosives have been left outside post offices and businesses in the past two months.
Wednesday's arrest came after another incendiary device was located beside the busy Tanglewood Shopping Centre in Tyler shortly after 11am.
A bomb-disposal robot was dispatched to safely retrieve the explosive, which had been stuffed into a mailbox.
Around 45 minutes later bomb squad crews moved in to investigate a suspicious van parked nearby.
Federal officials told the Tyler Paper that as many as five home-made bombs were found stashed inside it.
The suspect is understood to be disabled and uses a wheelchair, but no information was released on either his identity or his motive.
His arrest comes after officials raised the reward for leads on the bomber to $25,000.
More information is due to be released at a press conference on Thursday.
Federal agencies including the FBI, Bureau of Alcohol, Tobacco, Firearms and Explosives and U.S. Postal Service inspectors have all been working on the case.