Three Walmarts in eastern Kansas were evacuated early Sunday after bomb threats were telephone in.
This brings the total to at least 11 Walmarts in Kansas and Missouri since Friday afternoon.
A spokesman for the FBI confirmed to KCTV5.com Monday morning that the FBI is assisting local law enforcement agencies in the investigation.
Authorities, including the FBI, are declining to say whether they believe one person is responsible for the bomb threats or whether copycats are involved.
Two Walmarts in Lawrence were evacuated just before 2:30 a.m. Sunday. Lawrence Sgt. Kirk Fultz said one of the stores was at 550 Congressional Drive while the second one was at 3300 Iowa St.
Fultz said the voice in the message stated bombs were in the stores, and that many people would die. Police found nothing suspicious, and customers were allowed to return to the store.
In Leavenworth, the threat was about the Walmart Supercenter located at 5000 10th Avenue. The threat was made about 4 a.m.
According to police, the scene was cleared shortly after arriving.
At least eight Walmart locations across Missouri were evacuated Friday evening after receiving similar threats. Two of those locations are in the Kansas City area. Click here to read previous coverage.
Copyright 2012 KCTV (Meredith Corp.) All rights reserved.
Tuesday, March 11 2014 8:26 PM EDT2014-03-12 00:26:17 GMT
Residents of the quiet town of Excelsior Springs are on edge Tuesday after a woman was brutally attacked inside her home Monday.More >
An Excelsior Springs woman fought off a brutal attack and took actions that allowed a passing motorist to come to her aid. Neighbors say police searched the home of a middle schooler in connection with the attack. More >
Monday, March 10 2014 8:05 PM EDT2014-03-11 00:05:11 GMT
A fiery single-car crash claimed the lives of four people from Sedalia.The Missouri Highway Patrol said the wreck happened about 6:30 a.m. Sunday on Route B south of Sacajawea Road.Troopers said a 2007More >
A fiery single-car crash claimed the lives of four people from Sedalia. Grief-stricken family members have placed four crosses in their memory at the crash site. More >
Tuesday, March 11 2014 7:21 PM EDT2014-03-11 23:21:08 GMT
Authorities are investigating after a man's body was found in trash pile at recycling facility on the city's east side.More >
It was a terrible and incredible discovery Tuesday after a man's body was found in a pile of trash. The body was found early in the morning at the recycling center near Winchester Avenue and Raytown Road.More >
Prosecutors are expected to present evidence in the capital murder case against a 28-year-old man accused of killing three adults and a child at an eastern Kansas farm.More >
Nearly 8 hours of testimony was heard Tuesday about the events that led to Kyle Flack being accused of killing four people, including an 18-month-old girl whose body was found stuffed in a suitcase tossed into a creek.