Rex Tillerson will make his first trip to London as secretary of State on Friday to sign a book of condolences for the victims of Monday’s terror attack at a concert in Manchester.

The secretary of State will sign the book alongside U.K. Foreign Secretary Boris Johnson, according to the State Department.

Twenty-two people were killed and dozens were injured when a bomb went off at an Ariana Grande concert in the northern English city Monday night.

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The Islamic State in Iraq and Syria has claimed responsibility for the attack.

Tillerson’s visit comes after Manchester police announced they would stop sharing intelligence with the U.S. due to a series of leaks to U.S. media outlets.

British Prime Minister Theresa May said she would confront President Trump about the leaks during Thursday’s NATO meeting in Brussels.

Trump called for a federal investigation into the “deeply troubling” leaks in a statement Thursday.

Tillerson is currently accompanying President Trump in Brussels.