Crash barriers have been stolen from the TT course in Douglas and the west of the island.
The Department of Infrastructure said any further cases of safety equipment being taken would be reported to police.
It added replacing such roadside equipment costs the taxpayer significant amounts.
The DOI is currently preparing TT course for racing, including putting up signs and installing items for marshals.
King to visit Island today
Douglas is preparing to welcome King Charles this morning.
Warning over parking suspensions for King's visit
Police are warning anyone parking where they shouldn't before the King's visit tomorrow may find their car towed away.
Peel residents outraged over toxic powder spread near young gull
Residents in Peel say they've contacted police after toxic powder was spread along a street to discourage seagulls.
Commissioners tackle beach rubbish after online criticism
Ramsey commissioners say they've listened to public criticisms about litter and bins at one of the town's beaches.
This year's bookings will be honoured, says closing venue
A hospitality business in Douglas says it'll shut down at the end of this year.
Noel tackles charity car wash for Autism Initiatives
Noel Edmonds has been showing off his car-washing chops, to raise money for a good cause.
TT legend's bike could fetch up to £55k at auction
A motorbike ridden by TT legend Mick Grant on the Mountain course could fetch up to £55,000 at auction later this month.
Southern road temporarily closed this week
A road in the south of the Island is temporarily closed this week.
