Three men have been arrested on suspicion of involvement with terrorism following a police raid across two countries.

An unidentified man in his 20s was arrested at a business address in Hertfordshire, while two other men, one in his 20s and the other in his 30s, were arrested at residential properties in Luton, according to Scotland Yard.

The raid involved armed officers who invaded the three addresses without firing any weapons and are now searching the two Luton properties. Reports say the three men were arrested on suspicion of “being involved in the commission, preparation or instigation of acts of terrorism”.

Although no formal link has been made between the arrests and terrorist group ISIL, the British government has been under immense pressure to stop young British Muslims from travelling to ISIL-controlled parts of Syria to take part in terrorist activities.

In April, a family of 12 from England went missing after leaving the UK to visit their homeland of Bangladesh and failed to return to their home in Luton. Concerned relatives alerted police who later discovered the family had travelled to join ISIL in Syria.

Earlier this year, two brothers from Portsmouth were due in court after being accused of helping other Britons travel to the war-stricken country. Tuhin Shahensha, 27 and Mustakim Jaman, 23, who were arrested last October and are believed to share a “radical belief in violent jihad”.

Three British schoolgirls also made headlines this year after they crossed over the Turkish border in February to join the terrorist group.

Shiraz Maher, senior research fellow at King's College London, said: "Female recruits now make up a substantial part of those who have emigrated to join the ISIS cause, but little has been done to properly investigate the reasons why they are joining and how to prevent them.”

British authorities have estimated over 500 Britons have travelled to fight with the terrorist group since the beginning of the foreign-backed insurgency in Syria. With a growing number of recruits from Western countries, the ISIL has continued to control parts of land in Syria and Iraq.