In April 1984, Libyan refugees in London protested against the execution of two dissidents. Libyan diplomats shot at 11 people and killed Yvonne Fletcher, a British policewoman. The incident led to the breaking off of diplomatic relations between the United Kingdom and Libya for over a decade. Two months later, Gaddafi asserted that he wanted his agents to assassinate dissident refugees, even if they were just on pilgrimage in the holy city of Mecca—in August 1984, a Libyan plot in Mecca was thwarted by Saudi Arabian police.