The senator had received a threatening letter the day of the assault.

On June 10, two threatening letters were found in a ladies' room off the lab, the chief said.

Two bills and a threatening letter about a parking ticket.

The project has developed a threatening legal letter for those cases.

Right up to our wedding day I waited for another threatening letter.

He also sent many threatening letters to various high profile individuals.

Clients associated with the company also received similar threatening letters.

She and her husband began receiving threatening letters for their work against police brutality.

Inside the envelope was a threatening letter and a brown substance.

Felix has also gone to the trouble of leaving threatening letters.