"In the UK, the threat from international terrorism — which is determined by the independent Joint Terrorism Analysis Centre — remains at SEVERE, meaning that an attack is highly likely. In the last 18 months, the police and the security services have disrupted seven terrorist plots to attack the UK. All were either linked to, or inspired by, Daesh [ISIL] and its propaganda," May said in a statement to the House of Commons addressing Tuesday's terrorist attacks in Brussels.
"Belgium is a friend and an ally, and we work closely together on security matters," May said.
Following the attack, the United Kingdom raised the national threat to severe and issued a travel warning that has subsequently been lifted.
On Tuesday, at least 31 people were killed and some 260 injured in two bomb blasts in Brussels' Zaventem airport and an explosion at a metro station in the city. The Islamic State jihadist group, outlawed in many countries, including the United States and Russia, has claimed responsibility for the blasts.
