The latest on the response to last week's beach attack in Tunisia that killed dozens (all times local)

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9:20 a.m.

Prime Minister David Cameron says Britain will offer a full-spectrum response to extremism, describing the nation as being "united in shock and in grief," over the beach massacre in Tunisia.

Writing Monday in the Daily Telegraph, Cameron insisted the country would not be cowed.' He says that Britain will "stand up for our way of life."

Home Secretary Theresa May is traveling to Tunisia for talks on the extremist threat and to pay condolences.

A Royal Air Force transport plane is also being deployed to bring stranded tourists home. Cameron told the BBC that the government is working as fast as possible to give families information.

At least 15 Britons were among the 38 killed Friday at Sousse beach, but officials warn that figure is likely to rise.