The leader of the expedition on which a boy was killed by a polar bear has told an inquest the group had been supplied with an incomplete tripwire system.
The missing materials meant they had to set it up in a triangle formation rather than the advised rectangular shape, 31-year-old Michael Reid said.
He explained that his group also had to improvise using a paper clip to modify the trigger system because the brass fittings were missing.
He said: "The tripwire system in base camp worked inconsistently, the system that we tested at the ice-climbing camp on our first or second night out from the base camp operated 100% when we tested it."
More top news
A split set up this Sunday
Four Britons are dead after a serious crash in Al Khalas, a settlement roughly 30 miles north of the holy site of Mecca.
So-called Islamic State said they were behind the attack that targeted people receiving their national identification cards.