Boris Johnson will chair an emergency government COBRA meeting shortly about about yesterday's terror attack in Liverpool.
Downing Street have said police and counter-terrorism experts will be in the room with the prime minister at 12.45.
Number 10 would not comment on whether the country's terror level would be raised from substantial to severe following the attack.
The prime minister's spokesman said: "'The PM's thoughts remain with all those affected by the awful incident yesterday.
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"He wants to put on record his thanks to emergency services for their quick response, their professionalism and also the police for their ongoing work into this live investigation."
Mr Johnson has already spoken out after the taxi explosion which occurred outside the hospital yesterday.
Last night he tweeted: "My thoughts are with all those affected by the awful incident in Liverpool today.
"I want to thank the emergency services for their quick response and professionalism, and the police for their ongoing work on the investigation."
Police have today confirmed they are treating the Liverpool Women's Hospital taxi blast as a "terrorist incident".
Speaking at a press conference today Assistant Chief Constable and Head of Counter Terrorism Police North West Russ Jackson said the device was brought into the taxi and believed to be manufactured by the passenger.
He said the taxi driver picked up a fare from Rutland Avenue in south Liverpool and the man asked to go to the Liverpool Women's Hospital.
Shocking video footage from the scene shows the taxi explode, with the driver managing to escape from the wreckage.
ACC Jackson said officers are currently unsure of the motive behind the attack and said they "cannot at this time draw any connection" with Remembrance Sunday events near the Women's Hospital but confirmed "it is a line of inquiry".
Chief Constable Serena Kennedy said: "No specific threat to the area but have asked for patrols to be increased."
She also warned people about speculating on social media and asked for people stick to official sources of information.
Speaking to the BBC's Radio 4 Today programme, Mayor of Liverpool Joanne Anderson said: "Our emergency services were on the scene within minutes and have done a fantastic job of dealing with this incident and working with all the authorities throughout the night.
"Our job is to be calm and support our emergency services to do their job."
The taxi driver believed to be caught up in the blast has been named as David Perry.
Police said Mr Perry was injured in the attack but is now recovering at home.
