Three improvised explosive devices detonated at three different homes in Lusk on March 6.
No injuries were reported.
Two of the explosives were in the yards of a Wyoming Highway Patrol trooper and a local school principal, said Niobrara County Sheriff Rick Zerbe.
Law enforcement officials in Lusk are investigating whether the incidents were targeted attacks or random acts of mischief.
On Thursday, an undetonated bomb was found near the trooper’s home. The Wyoming Office of Homeland Security responded to the fourth explosive, sending a bomb technician from Casper to disarm the explosive.
Details on the size, chemicals and other specs on the bombs have not been disclosed by law enforcement officials.
The Lusk Police Department is investigating all four incidents.
In a media release issued by the Lusk Police Department, authorities urged people not to approach or handle any found plastic bottle that has fluid in it, especially if it is expanded or out of shape. If someone sees such an item, he or she is encouraged to call 911.
Anyone with information pertaining to this matter should contact the Lusk Police Department at 307-340-4055.