The United States and Britain are calling for an immediate ceasefire in Yemen, Reuters reported.

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The ceasefire is an effort to end the violence that has been occurring between the Iran-backed Houthi rebels and the government.

On Saturday, multiple missiles were fired at the U.S. Navy destroyer USS Mason while it was in international waters off the coast of Yemen. The destroyer was unharmed.

Secretary of State John Kerry said if the ceasefire was accepted by Yemen's opposing sides, then Ismail Ould Cheikh Ahmed, special envoy to the United Nations, would go through the details.

"This is the time to implement a ceasefire unconditionally and then move to the negotiating table," Kerry told reporters, according to Reuters.

"We cannot emphasize enough today the urgency of ending the violence in Yemen," he said after meeting British Foreign Minister Boris Johnson and other London officials.

He said the ceasefire should happen "as rapidly as possible, meaning Monday, Tuesday."

Johnson said the conflict in Yemen "was causing international concern; the fatalities that we're seeing there are unacceptable."

"There should be a ceasefire and the U.N. should lead the way in calling for that ceasefire," he said.