On Friday, two car bombs that failed to detonate were found in the West End of London and then on Saturday a burning car was driven into the reception area of Glasgow airport.
The UK’s terror alert is currently at critical, meaning that the security services fear that a terrorist attack in imminent.
Police have moved quickly, with at least seven people currently under arrest. However, it is believed that further suspects are on the run. Police are currently believed to be searching a number of addresses in Liverpool, Renfrewshire and Staffordshire.
The new Home Secretary Jacqui Smith is scheduled to make a statement to the House of Commons on Monday afternoon.
Travel security has been tightened across the country, with commuters and travellers warned to expect delays due to extra police patrols and searches.
Prime Minister Gordon Brown, speaking after chairing a meeting of Cobra, the civil contingencies committee on Saturday, called for the British people to be “resolute and strong”.
“Let me first of all thank the police, the security services and all the emergency services for the dedicated professionalism that has been shown in responding to the incidents yesterday in London and now today the attack on Glasgow Airport,” Mr Brown said.
“The first duty of the Government is the security and safety of all the British people, so it is right to raise the level of security at airports and in crowded places in the light of the heightened threat.
“I want all British people to be vigilant and I want them to support the police and all the authorities in the difficult decisions that they have to make.
“I know that the British people will stand together, united, resolute and strong.”
Anyone with any information is urged to phone the confidential Anti-Terrorism Hotline on 0800 789 321.
Police are appealing for anybody who saw the vehicle crash into Glasgow Airport, or anyone who saw a blue Mercedes on Cockspur Street in London late Thursday and early Friday to contact them.