Bomb threats were made to three Walmart stores over the weekend in Kansas.

The stores temparaly closed after someone called in the bomb threats, just days after at least eight false threats were called in to stores in Missouri.

Someone called a store in Gladstone, Missouri just before 4:30 a.m. Sunday to say a bomb had been planted at a store in Leavenworth, Kansas. That store was emptied out while investigators looked for explosives but found none.

Lawrence police were called just before 2:30 a.m. Sunday to both of that city’s Walmart stores after managers received threats from a male caller.

Similar threats were made Friday to stores in at least eight Missouri communities, and a store in Claremore, Oklahoma was briefly closed Wednesday after a threat there, as well.