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The Naval Criminal Investigative Service has increased a reward from $500 to $2,500 for information leading to the arrest of those involved in a spate of bomb threats called in to Navy bases in Hampton Roads earlier this week, Navy Region Mid-Atlantic spokeswoman Beth Baker said.

Someone called in a threat at Naval Station Norfolk early Wednesday that was followed by five others against Joint Expeditionary Base Little Creek in Virginia Beach. The threats were deemed noncredible.

On Thursday, a building at Norfolk Naval Shipyard was evacuated after an employee found a bomb threat written on a wall in a men’s bathroom.

Those incidents followed another threat made Monday against a ship at Little Creek and the search for a suspected mystery diver at Naval Station Norfolk after watch standers reported seeing someone in the water with scuba gear and goggles. No diver was found, and the threat at Little Creek was deemed a prank.

Those convicted of communicating a “bomb hoax” face a maximum of five years in prison and a $5,000 fine.

NCIS asks anyone with information to send an anonymous tip to 274637, or “CRIMES,” and type “NCIS” at the beginning of the message, followed by as much detail as possible.

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©2017 The Virginian-Pilot (Norfolk, Va.). Distributed by Tribune Content Agency, LLC.