Gunfire has erupted at a high school in Kern County, Southern California, according to the local sheriff's office.
The shooting took place at Taft Union High School. There is no immediate word on casualties.
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Kurt Cochran and his wife Melissa had been visiting London from the US to celebrate their 25th wedding anniversary and were due to fly home.
The Government has previously described the new coin - which enters circulation tomorrow - as "harder to counterfeit than ever before".