Bomb threats made to Walmarts throughout US

The bomb threat that shut the Linda Walmart for more than three hours on Tuesday was part of a string of similar threats that hit the giant retailer in the last few days, according to various media reports.

The threats were made across the country, sparking evacuations. No devices were found.

Starting Friday night, threats were made at Walmarts in North Dakota, Michigan, New Hampshire, Nevada and Arizona, along with the Linda store.

The Walmart in Grand Forks, ND, was shut down Friday night, as were two Walmarts in Michigan.

On Saturday night, a Walmart in Rochester, NH, was shut after two men in the store's parking lot announced there was an explosive device in the store. None was found.

Tuesday night, at roughly the same time as the Linda incident, the Walmart in Fallon, Nev., was shut down due to a phoned-in threat. The store remained closed for four hours.

The bomb squad from the nearby Naval Air Station was called into search and found nothing.

In Arizona, also on Tuesday afternoon, two Walmarts were evacuated after receiving threats.

Yuba County Undersheriff Jerry Read said a man called in the threat to the Linda store, telling an employee that a bomb was planted in the building.

Nothing was found.

He said investigators were following up several leads. He did not elaborate.