Police officers are seen near Forbury Gardens where stabbings took place in Reading, Britain, on June 21, 2020. Britain's counter-terrorism police said Sunday that the stabbing incident taking place in southern England's town of Reading on Saturday night "has now been declared a terrorist incident." (Photo by Tim Ireland/Xinhua)

A police officer stands at an entrance to Forbury Gardens where stabbings took place in Reading, Britain, on June 21, 2020. Britain's counter-terrorism police said Sunday that the stabbing incident taking place in southern England's town of Reading on Saturday night "has now been declared a terrorist incident." (Photo by Tim Ireland/Xinhua)

A police van is seen outside the block of flats where a suspect was arrested on suspicion of murder in Reading, Britain, on June 21, 2020. Britain's counter-terrorism police said Sunday that the stabbing incident taking place in southern England's town of Reading on Saturday night "has now been declared a terrorist incident." (Photo by Tim Ireland/Xinhua)

A police officer stands behind a police cordon at an entrance to Forbury Gardens where stabbings took place in Reading, Britain, on June 21, 2020. Britain's counter-terrorism police said Sunday that the stabbing incident taking place in southern England's town of Reading on Saturday night "has now been declared a terrorist incident." (Photo by Tim Ireland/Xinhua)

A police officer stands at an entrance to Forbury Gardens where stabbings took place in Reading, Britain, on June 21, 2020. Britain's counter-terrorism police said Sunday that the stabbing incident taking place in southern England's town of Reading on Saturday night "has now been declared a terrorist incident." (Photo by Tim Ireland/Xinhua)