Greg Milam, US correspondent

The White House believes home-grown terrorism is one of the greatest threats the US faces, ten years after the 9/11 attacks.

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The biggest domestic terrorism investigation since 2001 has focused on the northern city of Minneapolis.
It is estimated up to 40 young men from the Somali community in Minneapolis have been radicalised and recruited to join the al Qaeda affiliate al Shabaab in Somalia.
There are also growing fears that the US faces the threat of an attack within its borders from young radicals carrying American passports.

Al Qaeda is always very creative. They were creative on 9/11 and they are creative in going into our community.

Abdirizak Bihi

Seventeen-year-old Burhan Hassan was one of those young men recruited by al Shabaab.
His death in Somalia prompted his family to break the silence they say was enabling the recruiting.
His uncle Abdirizak Bihi now runs a campaign to highlight the risks of young men being recruited and encourage Somali families to speak out.
He told Sky News: “Al Qaeda is always very creative. They were creative on 9/11 and they are creative in going into our community.

Seventeen-year-old Burhan Hassan was one of those recruited by Al Shabaab

“By recruiting young refugees and taking them back to Somalia and training them with that mindset and sending them back here without anyone knowing it, it’s feasible they can attack Alaska, Washington, New York and London anywhere they want.”
His warning was repeated by Omar Jamal, a senior official at the Somali mission to the United Nations.
He told Sky News: “If a young man with an American passport is able to go to Somalia and blow himself up, we haven’t seen anything that would prevent that person coming back and blowing himself up here.”

A plane lands at the airport in Minneapolis

Congressional hearings into Muslim radicalisation and a new White House strategy have done little to calm fears.
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