Transcript for Mystery Continues in Church Bombings in New Mexico
to the race to find out who is behind those mysterious bombings at two New Mexico churches, the back-to-back blasts rocking the nearby churches during Sunday services. The FBI now investigating and ABC's Tom llamas is here with more. Good morning, Tom. Reporter: Good morning. Police say the explosive devices were intended to harm people and now the governor of New Mexico calling whoever set off the bombs a coward vowing to come after them. Can you contact the bomb squad? Reporter: This morning, the FBI and other federal agencies trying to track down who bombed two churches on Sunday in new Mexico. One bomb going off in the middle of a catholic mass during communion. Only a coward would place an explosive device in a place of peace and a place of worship. Reporter: The first bomb going off at 8:20 A.M. Inside a mailbox near the entrance to the Calvary Baptist church in las Cruces. Eyewitnesses say the explosion shook the building. The impact was so strong it not only shook the ground and the church like you see the immediate impression of an earthquake. Reporter: Then less than four miles away, around 20 minutes later at 8:40 A.M. Another blast, this time at holy cross catholic church. This large back went off and I could see the papers floating down inside. Reporter: Monsignor John Anderson about to start passing out communion not sure what to do. Police evacuating both churches, bomb-sniffing dogs brought in, luckily no one injured. Investigators are not sure what type of explosives were used but assume that the two bombings are related. But the bigger mystery, why? And right now police are advising people to be on the lookout for anything suspicious at any other churches in that area but to make sure they personally don't inspect anything to call 911 if they see any type of device, guy, just so scary on a Sunday and in one case in the middle of mass. Horrible. All right, Tom, thank you.
This transcript has been automatically generated and may not be 100% accurate.