Police in Herts have promised to increase visible patrols across the county after the government announced the threat from international terrorism has increased.

The reassurance comes even though the Herts force says there is no immediate threat to tackle.

Prime Minster David Cameron said last week that the threat level faced by the UK has increased from ‘substantial’ to ‘severe’ – one below the highest rating – in response to conflicts in Iraq and Syria.

Senior British police officer Mark Rowley, who is the leading the counter-terrorism operation, said security and protection measures were being upped as a result.

Herts Police said: “While it is believed that there is no direct threat to Hertfordshire at this time, a response to this change has been implemented by the constabulary reflecting the increased nationwide threat.

“This response includes a strong visible police presence across the county to provide reassurance to all communities and to protect the public from harm.

“We encourage the public to be vigilant and if they have any concern about activities or behaviour of people in their area, they should call police immediately on 101 or if it is an emergency call 999.”

The threat level system, which was established in 2006, indicates the likelihood of a terrorist attack in the UK.

There are five levels of threat which range from low to critical.