Postal investigators have asked local police departments to increase their patrols around area post offices after receiving another round of bomb threats.

About a dozen new bomb threat letters were received by Minnesota post offices Monday, according to a Mankato Police Department report. The letters were all sent to different locations.

Christopher Anderson, a postal inspector in St. Paul, called Mankato police to report the new round of letters at about 3:45 p.m. Monday. A similar call was made to the North Mankato police a short time later, according to calls for service records.

None of the new letters were sent to post offices in the Mankato area, said Jeff Long, a public information officer with the U.S. Postal Inspection Service in Minneapolis. They were sent to post offices in Minnesota.

Long said inspectors do not want to disclose the number of new letters sent because it could impede their investigation.

The first round of bomb threat letters were received by eight post offices in the Mankato area during the first week of February. In addition to Mankato and North Mankato, those post offices were in Lake Crystal, Le Sueur, Le Center, Madelia, New Ulm and Sleepy Eye.

Police departments in all those cities received updates about the investigation Monday, Long said. Inspectors want to keep police updated in case new leads develop, he added.

“The investigation hasn’t stopped since day one,” Long said. “We’re providing them with updates about what’s going on with the investigation.”

Dave Wintheiser, New Ulm’s post master, said last month that the contents of the letter concerned him. The threats were not taken lightly and extra security measures were put in place, he said.

“I was in shock and there was a little bit of fear and concern for the people here,” Wintheiser said then about the letter he received. “I haven’t ever received a letter like that before, and I hope I never get one again.”

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