Authorities are continuing their investigation into how a modified hand grenade ended up along a highway in Brownsville.
Brownsville police were called to the 6100 block of U.S. Expressway 77/83 around 5 p.m. Sunday.
Investigators told Action 4 News that authorities received reports about an Improvised Explosive Device (IED) was on the side of road.
Police said the modified hand grenade had a poorly constructed casing and no detonation device.
Authorities had rerouted traffic as a precaution while the Brownsville Police Department bomb squad disarmed and disabled the device.
Brownsville police said there was no danger to any infrastructure or to the public at any time during the incident.
Investigators said the IED had a very small yield of impact and if it had actually exploded, it would have caused minimal damage.
But as of Monday afternoon, authorities still don TMt know the IED got there or who made it.
Anyone with information is asked to call Brownsville Crime Stoppers at (956) 546-TIPS or (956) 546-8477.