Police said in they arrested a 21-year-old man in the west London suburb of Hounslow, which is home to London's Heathrow Airport, just before midnight Saturday.
He was arrested by the Kent Police under the Terrorism Act and remains in custody at a London police station.
Following the bombing of a London tube train at Parsons Green station on Friday, the terror threat level was increased from severe to critical.
Police are continuing to search a house in Sunbury-on-Thames in Surrey.
Earlier an 18-year-old teenager was arrested in the departure area of the port of Dover in connection with the attack on Saturday morning.
Residents of the neighborhood say the house that was searched is occupied by an elderly couple - Penelope and Ronald Jones - who have taken care of foster children for decades.
In the wake of the bombing, police hinted they were searching for more than one suspect, and said they were keeping an "open mind" as to whether multiple people were involved.
She added there was "no evidence" to back up Islamic State's claim there were more "live" explosive devices.
Rudd made the comments on BBC's Andrew Marr Show on Sunday, after Trump claimed the person who carried out the attack was known to British police.
"It's never helpful to have speculation about an ongoing operation and I would include the President of the United States in that comment, " said Rudd.
Amber Rudd praised the police for the progress they have made in the investigation and called on the public to remain vigilant after Prime Minister Theresa May put Britain on the highest security level of "critical".
The blast was the fifth major terrorist attack in Britain this year.
The White House issued no immediate comment, and Trump aides have said in the past that his tweets "speak for themselves". In July, he posted a video to his account that showed him punching a physical representation of CNN in the face.
Dhaka has also protested Myanmar's branding of the Rohingya people as "Bengalis" - the main ethnic people in Bangladesh. The government said the movement of the settlement's refugees would be restricted. "Refugees are still pouring in".
Moreover, for the first time, Ivy and David even did not see each other, due to the fact that their communication was online. It should be noticed that these two people began relations just as friends, as they lived in different countries.
They suggested, he now believes he may be able to obtain enough evidence to charge specific foreign entities with a crime. The fact that Mueller obtained a warrant means he's already made a strong case for Russia's meddling with the election.
While Luke will probably have a key role to play in the new movies, it’s certain the new actors will dominate the storyline. He felt he needed to know what all those years have done to Luke even if the material doesn’t get told in the actual movie.
This competition of managers started by Pep became even more interesting than the competition of their football teams. He believes that the tough competition will help him and his Manchester City team to go to the next higher level.
Spaniard Carlos Sainz, set to move to the works Renault team next year, rounded out the top 10 for Toro Rosso. Nico Hulkenberg was best-of-the rest in seventh for Renault , just ahead of McLaren 's Fernando Alonso .
The reputation of Macao as the place of the famous casinos, brothels and clans triads selling opium was born in the 18th century. And it lasted until the 60s of the 20th century, while a powerful businessman Stanley Ho became interested in the region.
Maybe that's not at all warranted considering it's still early days, but the mistakes continues to pile up and cost us dearly. Asked if the competition for places has ever been this intense at Turf Moor, Vokes said: "No, not since I have been here".
Israel has blockaded Gaza for a decade, and its border with Egypt has also remained largely closed in recent years. The decision of Hamas to finally hold negotiations with Fatah may indicate first steps towards reconciliation.
Spectacular dancers will complement the spectacular dance of any composition, leaving an unforgettable impression in your memory. A special chic to the club is given by colorful and incendiary performances, over which a professional choreographer works.