British prosecutors have charged two men with trying to join the Islamic State extremist group in Syria.

One of the men is also charged with planning a terrorist attack on U.S. military personnel in Britain.

The Crown Prosecution Service said Tuesday that 24-year-old Junead Ahmed Khan and his 22-year-old uncle Shazib Ahmed Khan have been charged with trying to join the extremist group. Junead Khan was also charged with plotting to attack U.S. military personnel.

“We have concluded that there is sufficient evidence and it is in the public interest to charge Junead Khan and Shazib Khan with the intention of committing acts of terrorism,” said Deborah Walsh, deputy head of Counter Terrorism at the Crown Prosecution Service.

The men were arrested last week in Luton, north of London.

A third man who had been arrested on suspicion of terrorism at the same time has been released without being charged. He has not been named.

British officials say some 700 Britons have traveled to Syria in support of the militant group.

The two are scheduled to appear at Westminster Magistrates’ Court later Tuesday.

(AP)