Governments around the world expelled Syrian ambassadors and diplomats Tuesday, an unusual, coordinated blow to Syrian President Bashar Assad's regime following a gruesome massacre that the United Nations said involved close-range shootings of scores of children and parents in their homes.

The United States, Britain, Canada, Australia, France, Germany, Italy, Spain, Bulgaria and the Netherlands took action Tuesday against Syrian diplomats. Britain's foreign secretary said the countries involved in Tuesday's expulsions would also push for tougher sanctions against Syria.