Theresa May has condemned the “cowardly” terror attack on a packed London Tube train as she vowed to defeat the extremists.
The Prime Minister also said the UK’s terror threat level would stay at severe rather than raise it to critical, although this would be kept under review.
Speaking after chairing a meeting of the Government’s COBRA emergency committee, Mrs May said there would be an increased armed police presence on the capital’s transport network.
The PM said: “The police and the security services are obviously doing all the work to discover the full circumstances of this cowardly attack.”
At least 22 people were injured in the blast aboard the rush hour District Line train at Parsons Green station in west London.
While most victims suffered flash burns, some were hurt in the ensuing panic as people fled.
Terror police, who are being assisted by MI5, are scouring CCTV in their hunt for the bomber.
Investigators are also examining the improvised explosive device, which is understood to have had a timer.
Images show a large flaming bucket with wires coming from it on the floor of the carriage.
Mrs May said the device was “intended to cause significant harm”.
She encouraged the public to “go about their daily lives but remain vigilant”.
Mrs May said: “The threat of terrorism that we face is severe, but by working together we will defeat them.”
She added: “We do need to ensure we are dealing with not just the terrorist threat but with the extremism and the hate that can actually incite that terrorism.
“That is why we are looking very carefully at the powers that our police and security services have to make sure they have the powers they need.”
The Government was also working with technology giants, and Mrs May and French President Emmanuel Macron will hold a joint meeting at the United Nations next week “to talk about what more we can be doing to ensure that we deal with the terrorist propaganda, with the extremist propaganda, with the hatred that is put out across the internet”.