A group of young Scottish musicians are stranded in Lourdes without their instruments, after they were lost by British Airways.

The volunteers arrived in the French town to discover that their drums, keyboards and microphones had been scattered around the globe, in Texas, Russia and Oman.

The incident is the latest in a series of baggage failures this summer by BA, which at one stage was facing a backlog of 20,000 missing items.

The latest victims are a group of 70 teenagers from the St Margaret's of Scotland youth group, Glasgow.

They are in Lourdes on a week-long trip to assist the archdiocese at its annual pilgrimage, by performing music for the sick.

Last Thursday they flew to Toulouse from Glasgow, via Gatwick, but arrived to find 23 bags of equipment were missing.

Five days later they are still without 11 bags of equipment, and the group is set to return this weekend. Michael Canning, 49, group leader, said it would be a miracle if they received the instruments in time to perform.

He said: "We are utterly powerless to do anything about this.

"The musical equipment is a vital part of the work the young people are here to do.

"As well as playing concerts to entertain the patients, their music is an integral part of the liturgy during mass. We have been told that our equipment is dotted round the world."

Yesterday, the group performed music at a mass healing and at a garden party. The concert was able to go ahead only after they managed to hire replacement equipment locally.

Tour operator John Tangney, of Tangney Tours, Kent, has been helping the group by co-ordinating efforts to retrieve their instruments.

Mr Tangney said: "According to the BA baggage tracker, one of them is in Muscat, Oman, one is in Houston, Texas and another is in Ekaterinburg, Russia.

"When I rang Toulouse I got a message saying the tape had run out on their answer machine. At Gatwick, the BA baggage line said they were too busy to take my call."

The errors are the latest in a series of embarrassing failures by BA this summer.

Last weekend, 4000 bags were stranded at Heathrow after a baggage belt failure. At one point as many as 20,000 bags were missing.

Last Friday, British Airways reduced the number of bags to 5000 after sending many to Milan by truck for sorting.

After the latest failure, a British Airways spokesman said: "We apologise to the band for the disruption in their set and to the individual people whose instruments did not arrive. We understand how disappointing that must be."