From a daily average of 28, the number shot up to 56 by the middle of this week, Greater Manchester Police said.
British PM Theresa May said the threat level in the country will remain at critical and that 1,000 army troops have been deployed to boost security.
The new arrests came as the injured toll doubled from 59 to 119.
The terror threat level has been raised to its highest level of "critical", meaning further attacks may be imminent.
Eyewitnesses reported hearing a loud "bang" from inside the venue.
Security researchers with Kaspersky Lab have recorded more than 45,000 attacks in 99 countries, including the UK, Russia, Ukraine, India, China, Italy, and Egypt.
The Duke of Edinburgh will no longer carry out public engagements from September.
He said he wants to have an influence on the negotiations of Britain's exit from the 28-member European Union.
India had given a formal extradition request for Mallya as per the Extradition Treaty between India and the UK through a note verbale on February 8
After debating the motion put forward by May in the House of Commons, 522 of the 650 sitting MPs voted in favour of the June 8 election, passing the threshold of two-thirds needed to approve the plan.
There will be a House of Commons vote on Wednesday on the proposed election and May will need Parliament's backing to hold a vote before 2020.
Andreea Cristea's life support machine was turned off by her family on Thursday afternoon, Scotland Yard said on Friday.
It sets the clock for a two-year negotiation process for Britain's relationship with the EU as a non-member.
The Scotland Yard's Indian-origin deputy assistant commissioner, Neil Basu, in a statement said Khalid Masood's attack had echoes of the rhetoric of the Islamic State but no evidence at this stage suggests he was linked to the group.
Scotland Yard also conceded that they may "never understand" the 52-year-old attacker's motive.
Metropolitan Police Acting Deputy Commissioner and Head of Counter Terrorism Mark Rowley said in a statement that a total of nine persons remain in custody and one woman has been released on bail.
"We are not afraid. An act of terrorism tried to silence our democracy, but today we meet as normal," May said.
An attacker drove a car along a pavement in Westminster, stabbed a policeman and was shot dead by police in the grounds of Parliament.
May has already announced that she will make a statement to the House of Commons shortly after invoking Article 50 of the Lisbon Treaty.
India has expressed dismay at the United Nations' continued struggle to find a definition for terrorism, saying there seems to be more cooperation between terrorist groups than the countries fighting them.
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