The family of a British charity volunteer who died during a trek in north India have described their heartbreak at the loss of their "beautiful, bright, caring girl".

Niamh Campbell, understood to be from Clackmannanshire in central Scotland, had been working with the Project Trust teaching English, maths and science at a school in Bangalore since last August.

The charity said the 19-year-old was trekking north of Manali, in Himachal Pradesh, on Monday as part of a group led by "an experienced guide from a reputable company which specialises in trekking in the region".

She fell ill during the trek and was taken by ambulance to hospital in Manali, where she was pronounced dead on arrival.

A spokesman for the Campbell family said: "To hear Niamh called a 'Scots charity worker' fills the family with huge pride, but for that to come from her sudden and unexpected passing has left them heartbroken and devastated.

"We now know how many lives she touched in a life all too short. Niamh was true to herself right up to the end.

"She was surrounded by friends being loving, caring, spontaneous and with a dog running by her side. The family are heartbroken at the loss of their beautiful, bright, caring girl and ask that they are given privacy to mourn her passing."

A senior member of Project Trust staff is in India to provide support on the ground, while other senior members of staff are giving support to the Campbell family in Scotland.

Project Trust chief executive Ingrid Emerson said: "Niamh was a lovely girl and an impressive and committed teacher, always hard-working and considerate of others.

"Our thoughts and deepest condolences are with her family and her fellow volunteers, and our priority now is to provide them with whatever support we can."

Tributes have also been paid to Ms Campbell on social media.

Reegan Thomson wrote: "Thoughts are with the Campbell family, RIP Niamh."

Scotland's International Development Minister Humza Yousaf tweeted: "Deeply saddened hear of death of Scottish aid worker Niamh Campbell, volunteer with Project Trust. Condolences to family and friends."

Based on the Isle of Coll, the Project Trust organises overseas volunteering placements for school-leavers.

Around 300 people from across the UK are selected each year for 12-month teaching and social care projects in Africa, Asia and South America.