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Johnson appointed UK foreign secretary, Hammond named Chancellor

Former London Mayor Boris Johnson was appointed British foreign minister on Wednesday.

He was one of many new cabinet appointments after Theresa May officially became the prime minister.

BBC reported that Foreign Secretary Philip Hammond was named Chancellor of the Exchequer. Earlier, George Osborne, current Chancellor of the Exchequer, resigned from the U.K. government.

Energy Secretary Amber Rudd was also appointed as British interior minister.

Conservative lawmaker David Davis was appointed secretary of state for exiting the European Union. Davis supported the campaign for the U.K. to leave the EU.

Liam Fox, a pro-Brexit campaigner, was appointed as minister for international trade, according to May's office.

British defense minister Michael Fallon will retain his post in May's new cabinet, her office said on Wednesday. Fallon has served as defense minister since July 2014.

Dan Kitwood | Getty Images

The change of leadership and expected cabinet reshuffle follows the U.K.'s vote to leave the European Union (EU) on June 23. Cameron formally resigned on Wednesday, in line with his pledge to step down if the referendum went against him and the British voted to leave.

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— Reuters contributed to this report.