Despite the terror threat level having been reduced police in Herts and Cambs say you can expect to see them continuing high visibility patrols in the wake of Friday’s bomb attack on the London tube.

The national threat level has been reduced from Critical to Severe following the attack in which a makeshift explosive device went off on a train at Parsons Green tube station, injuring 30 people.

Police are currently questioning two people after the attack – an 18-year-old and a 21-year-old.

Meanwhile CCTV footage has been obtained by ITV which shows a man carrying a Lidl bag 90 minutes before the explosion – the bomb itself was wrapped in a similar bag.

On Saturday, the 21-year-old was arrested in Hounslow, west London and the 18-year-old was detained at Dover port.

Police are searching two addresses in Surrey in connection with the arrests - one in Sunbury-on-Thames and another in Stanwell.

Herts and Cambs police have said people can expect to see officers carrying at enhanced patrols today as the threat level remains high. It says more officers will continue to be deployed at key locations and people can expect to see armed officers in some places.

They are urging people to remain alert at home, work and when out and about, but not to be alarmed. You should report any suspicious activity to the police by calling or visiting the Anti-Terrorist Hotline on 0800 789 321 or gov.uk/ACT

You should also report online terrorist and extremist material online by clicking on gov.uk/ACT

If you are caught up in a firearms or weapons attack you should follow the ‘RUN. HIDE. TELL’ advice: RUN, if you can; HIDE if you can’t run; TELL, when you can, the police what’s happening. Further advice is available here.