Dutch police arrested a Somalian with, I presume, a British passport, at Schiphol Airport as he was on his way to Entebbe, in Uganda.

He had taken off from Liverpool, originally.

He's arrested on suspicion of being "involved in a foreign terrorist organization," according to the Dutch Ministry of Justice. The adjective "foreign" here means foreign to Holland. It's probably foreign to Britain, Somalia, and Uganda too.

How  is he described in headlines?

• Man:Dutch Police Arrest Man With Suspected Terror Links,Wall Street Journal
• Briton: Anti-terror police arrest Briton Scotsman
• Briton:Dutch Hold Briton for Possible Terrorism Involvement San Francisco Chronicle
• Briton:Briton arrested at Schiphol airport on suspected terrorist involvement The Guardian
  UK Terror Suspect: Dutch arrest alleged UK terror suspect at airport, The State , Toby Sterling
• British 'terrorist suspect: British 'terrorist suspect' is arrested at Schiphol, DutchNews.nl

How about "Somalian Muslim Arrested On Suspicion Of Terrorism"?