Eurovision organizers announced a set of new changes that give more power to voters and let more viewers vote.
The contest will be staged next May in the birthplace of The Beatles after Britain was asked to hold the event in place of war-torn Ukraine, the designated host country.
The soccer Champions League final in Paris was marred as Liverpool fans were sprayed with tear gas as they tried to enter the stadium, delaying the start of the match by 35 minutes.
Authorities in England have arrested four men in connection with Sunday's deadly blast, which took place in a taxi outside a women's hospital. They say a motive is not yet known.