After the third attack in less than three months, Prime Minister Theresa May said Thursday's election would go ahead.
The arrests were made in connection with Saturday's attack that killed seven.
Across the Arab world, changing demographics, a lack of basic rights and Western interventions all drive young people toward extreme violence.
Suicide bomber Abedi was one of 20,000 people known to MI5 but not one of the 3,000 people under active investigation.
The New York Times posted leaked images of the remnants the suicide bomber's device on Thursday.
Ramadan Abedi denies his son's involvement in the attack on Manchester Arena.
The Tory Party's manifesto heightens the chance of drawn out negotiations and the hardest of Brexits.
The 37-year-old was due to board a flight for Turkey Tuesday evening.
Abedi blew himself up with an improvised explosive device, killing 22 after an Ariana Grande concert.
Top spies say European security services are more disciplined than their U.S. counterparts.
Viktor Ozerov, chairman of Russia's defense committee, says Britain is at fault for not working with Moscow.
The Queen condemns "act of barbarity" in the northern English city.
The suicide bombing killed 22 people, including children, on Monday night.
"We remember fascism. We never thought it would happen in America."
A tweet from the embassy comes days after a report that suggested Rich was a WikiLeaks informant, which has since been refuted.
The role of Europe's top court, the rights of EU citizens, and who owes money are all likely to be flashpoints in talks.
The Duke and Duchess of Cambridge were caught on camera in 2012 while on vacation in southern France. Now they want damages.
The EU's hard-line position is a classic example of cutting off one's "nez" to spite one's face.