LONDON, Ramadan 12, 1436, Jun 29, 2015, SPA -- The number of Britons confirmed killed by an extremist gunman in Tunisia last Friday has risen to 18 from 15 and the final death toll is likely to increase to around 30 people, Reuters cited a spokeswoman for British Prime Minister David Cameron as saying on Monday. "We have now confirmed 18 British nationals killed and we expect that number to rise further ... and it's likely to be around 30," the spokeswoman told reporters. --SPA 15:46 LOCAL TIME 12:46 GMT www.spa.gov.sa/w