Hundreds of teenagers tackle Dartmoor's Ten Tors challenge

The teams set off on the two-day challenge at 07:00 BST

More than 2,400 teenagers are taking part in the annual two-day Ten Tors challenge across Dartmoor.

The event involves young people aged between 14 and 19, in teams of six, trekking up to 55 miles (89km).

Camping overnight, the teams complete the challenge without adult guidance and set off at 07:00 BST.

Among those taking part are seven boys from Wiltshire who were airlifted off the moor after getting lost while practising for the event in April.

Organisers said the teams would arrive back at base from 09:00 BST on Sunday.

The majority of the teams who enter are from the south-west of England

Almost 300 youngsters with special physical or educational needs are also taking part in the Jubilee Challenge, completing routes of up to 15 miles (24km).

Troops involved in the event include members of the Army, the Territorial Army and the Royal Navy.

The majority of the teams who enter are from schools and youth groups from across the south-west of England.