Authorities are investigating the potential existence of a network linked to the attack.
Police and the British secret service have found yet another explosive device and fear there may be more bombs in Manchester.
According to the Independent today, the authorities carried out a controlled explosion at dawn.
It is being investigated the possibility of a network linked to the attack of this Monday night at a concert of Ariana Grande, which resulted in 22 dead and 59 injured.
So far, eight of the suicide bombers have killed 52 people traveling in buses and in the London Underground in 2005.
The person responsible for the attack died on the spot. Salman Abedi, a Briton of Libyan origin aged 22, blew himself up at one of the exits of the Manchester Arena.
The attack was claimed by the Islamic State extremist group, but there is no official confirmation.