Federal investigators are scrambling to find out who’s leaving suspicious—and potentially explosive devices—at locations around East Texas. The devices keep coming. Two more were found just this week. In all, more than a dozen devices have been found in five different counties since just the beginning of the year. So far, no one’s been hurt, but investigators are becoming more concerned with each device they find. The more recent devices have looked like pipe bombs. Earlier ones were more like Molotov cocktails. Some of them have been placed in mailboxes. For example, of the two incidents yesterday, one was found in a collection box in Longview, Texas. That’s about two hours east of Dallas. The other was found in a residential mailbox in nearby Lake Cherokee. Teams from the Bureau of Alcohol, Tobacco, Firearms and Explosives are dismantling the devices and shipping them off to an ATF lab for investigation. The US Postal Inspection Service and ATF have increased their reward in the case. They’re now offering $25,000 for tips that lead to the arrest or conviction of anyone involved. Longview, TX is in the same general area that was targeted by church arsonists earlier this year. The ATF made two arrests in that case.