LONDON (Dispatches) -- British police said they arrested two more people during raids Saturday over the Manchester concert bombing, as Prime Minister Theresa May announced a reduction in the country's threat level from critical to severe.
The two men, aged 20 and 22, were arrested in North Manchester early Saturday after police gained entry to an address using a controlled explosion, and a bomb disposal team was later involved in a raid in Moss Side, to the south of the city.
The arrests bring to 11 the number of suspects held in Britain over Monday's blast at a concert, in which 22 people died and 116 were injured, and for which the Daesh group has claimed responsibility.
Police in Libya also detained the father and brother of 22-year-old bomber Salman Abedi.
British police on Saturday said they were raiding an address in Moss Side, with AFP staff reporting that a bomb disposal vehicle was at the scene and that the area was being evacuated.
Mark Rowley, head of Britain's counter-terrorism police, said on Friday that police had captured "a large part of the network" linked to the bombing, in which seven children aged under 18 were among the 22 dead.
"We are very happy we've got our hands around some of the key players that we are concerned about but there's still a little bit more to do," he said.
Prime Minister May said Saturday that the terror threat level had been reduced from critical - its highest level - to severe, having been raised in the wake of the attack.
"There are now 11 suspects in custody," she said in a statement. "In the light of the developments, the independent joint terrorism analysis centre has this morning taken the decision to reduce the threat level from critical to severe."
"We should be clear about what this means: A threat level of severe means an attack is highly likely, the country should remain vigilant."
She also announced that Operation Temperer, which involved the deployment of armed forces personnel patrolling alongside police, would wind down after the bank holiday weekend.
Armed police will be on patrol over the holiday weekend, with security increased at football's showpiece FA Cup final at London's Wembley Stadium on Saturday.
The bombing was the latest in a series of Daesh-claimed attacks in Europe.
Authorities are currently handling 500 terror-related investigations into 3,000 individuals, and it was revealed Friday that around 20,000 more people are on the intelligence radar as posing a "residual risk".