The police said a 21-year-old was held in connection with three fires, including one at a property owned by the British prime minister in the Kentish Town neighborhood.

President Trump, who will also go to Qatar and the United Arab Emirates, has told advisers that he wants to sign deals worth more than $1 trillion on the trip.

On Monday, Hamas released the American Israeli citizen, who was serving in the Israeli army when he was captured on Oct. 7, 2023.

In his first audience with the press as pontiff, Leo renewed his pleas for a more peaceful world and quoted his predecessor, Pope Francis, who had called for communication that is free from aggression.

Civilian flights were returning to normal, and stocks jumped in both nations, signs of confidence that the agreement to halt fighting was holding.

Prime Minister Keir Starmer said his government was “taking back control of our borders,” weeks after a right-wing populist party, Reform U.K., made gains in municipal elections.

The Kurdish group waged a bloody insurgency against the Turkish state for four decades.

President Trump goes to the Gulf kingdom this week seeking $1 trillion worth of investments in the United States — a sum equivalent to the entire Saudi gross domestic product for a year.

The Kurdistan Workers’ Party, or P.K.K., said that it would lay down its arms and disband, a decision that could reverberate in neighboring countries.

At a conclave with many new members, a swift, stunning consensus built around an unknown to many outside of the church.