Photos taken inside a District Line train show a white plastic bucket inside a foil-lined shopping bag.
London police are being supported by Britain's MI5 intelligence service, he said.
Most of the injured people suffered burn injuries.
Commissioner Neil Basu, the senior national coordinator for counter-terrorism policing, declared the blast a terrorist incident.
"Our city utterly condemns the ugly individuals who attempt to use terror to harm us and destroy our way of life", said London Mayor Sadiq Khan.
The investigation is being led by the Metropolitan Police's counter-terrorism command and involves hundreds of detectives, with support from the intelligence community. Twenty-two people were hurt, according to the BBC, though no injuries have been reported as life-threatening, and Prime Minister Theresa May has stated that the U.K.'s terror threat level will remain at severe.
Sampha beats Ed Sheeran for Mercury Music Prize
With its unique creativity, rich musicality, depth and vulnerability, it resonates emotionally and speaks to the heart. Although they don't always get it right and there have been some forgettable winners as well.
CST, the security organization of the British Jewish community, reissued security instructions after the attack to report any suspicious objects to police.
According to the Sky News report, an eye witness said that he saw remnants of flash/smoke, "hordes of people" and people "running down the platform" at Parsons Green station.
Babar Azam (48 off 31 balls) also missed out on his half century as Thisara Perera dismissed him in the final over of the innings. His and Pakistan's only hundred in a Twenty20 worldwide had come against Bangladesh during the World Twenty20 tournament in 2014.
As of Tuesday afternoon, FPL's website showed 183,100 of its 210,700 Collier County customers were still without power . FPL recently boasted of having spent $3 billion to replace wooden poles with concrete poles and harden its systems.
Hurricane Jose now sits on the northern side of the Caribbean Islands and it might just be heading towards the Canadian coasts. However, most computer models indicate Jose will stay out to sea and complete a tight enough loop to avoid moving onshore.
It will feature appearances, performances and special messages of support from stars in Los Angeles, New York and Nashville. However, the devastation that Hurricane Harvey [VIDEO ] brought about is still a significant obstacle faced by the victims.
Aung San Suu Kyi won the Nobel Peace Prize in 1991 for leading the nonviolent struggle for democracy and human rights in Myanmar. Reports of attacks on civilians by Myanmar security forces are "disturbing" and "completely unacceptable", he said.
Before that, today's meeting in Lima, Peru , was scheduled to be a vote between Paris and LA for the 2024 Games only. The successful bid will be announced an unprecedented 11 years before the actual Olympics are to take place.
And at a Black History Month event held at the White House soon after taking office, Trump railed against the media . Scott has been outspoken on issues of racism but supportive of the president's low-tax economic agenda.
These allegations are nothing new - they're familiar to anyone who has spent any time in politics in either state. Because of its swing-state status, Kobach said, "New Hampshire faces risks that other states do not face".
Apple Heart Study And watchOS 4
The Watch is being used to collect heart rate data using the app which was created by Stanford using Apple's ResearchKit platform. Customers can set up notifications to know if their heart rate has elevated above a specific range while being inactive.
Rebel Wilson wins Australia's highest defamation pay out
What do you think of Rebel Wilson's win? The judge said he realized that the data from mysterious paid source was false. Wilson was awarded $3.6 million, which is the largest payout of a defamation case ever in Australia's history.