United Kingdom police have arrested seven people in the aftermath of the bombing, with Home Secretary Amber Rudd saying Abedi "likely" did not act alone.
The British investigation is now reportedly focusing on who helped Abedi, and on whether the bomb-maker is still at large.
Brit officials were stunned when photos appearing to show debris from the attack at an Ariana Grande concert at Manchester Arena were leaked to The New York Times yesterday. But he said there were still "gaps in our understanding" of the plot, as investigators probed Abedi's potential links to jihadis in Britain, Europe, Libya and the Middle East.
The deployment, created to free up police officers to pursue the terrorists behind the attack, is the largest on the British mainland in decades.
"We're strong but mighty", said resident Sophia Goodman. U.S. officials first caused outrage after they leaked the name of the attacker on Monday before Manchester police did so themselves.More news: Trump says Netanyahu, Abbas assured him they are ready for peace
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GMP said officers made the latest arrests as they executed a warrant at an address in Cheetham Hill, north of the city centre.
Ahead of her meeting with President Donald Trump in Brussels today, Prime Minister Theresa May said she intends to "make clear" that "intelligence that is shared between our law enforcement agencies must remain secure". The two leaders will meet at a North Atlantic Treaty Organisation summit in Brussels later on Thursday. On Friday, she released another statement on Instagram. "When that trust is breached it undermines these relationships, and undermines our investigations".
Two men were arrested in Manchester Thursday morning in connection with Monday's lethal terror attack at the Ariana Grande concert which claimed the lives of at least 22 people and injured scores more.
Investigators are now focussing on the terrorist network they believe the 22-year-old Manchester-born suicide bomber was part of. Another brother, 23-year-old Ismail, was arrested on Tuesday in Manchester.
Ramadan Abedi, alongside his other son Hashem Abedi, Salman's younger brother were both arrested separately in the Libyan capital Tripoli by counter-terrorism forces on Wednesday.