Glasgow 2014 Commonwealth Games security cost up 200%
The security budget for the Glasgow 2014 Commonwealth Games has more than trebled to £90m.
The Scottish government said additional costs have been identified following a review of the 2012 London Olympics.
It will add £37.7m to the current £27.2m budget, with an extra £25.1m coming from the contingency budget.
The extra cash will be spent on securing the athletes' village, hotels and training venues, and providing additional CCTV and perimeter fencing.
The athletes' village will be secured for six months before the games begin and provisions will be put in place to provide round-the-clock security at some hotels and training venues.
Plans for 50% of the security to come from private companies have also been revised.
A number of firms, rather than just one supplier, will be used to reduce the risk of one firm failing to deliver as happened before the London Olympics.
Ms Robison said a "detailed security review" had taken place following a "comprehensive observation programme at London 2012".
"There is now a need to secure venues for longer than originally planned to allow for build requirements, while more physical security at sporting venues, such as CCTV, perimeter fencing, and security checking equipment, is required," she said.
"London 2012 highlighted the risk of having a single company providing private security, so the organising committee, in collaboration with the police, has split the private security tender for 2014 into multiple contracts.
"Adjustments have also been required to meet current UK event security and safety guidelines for stadia, indoor sports venues and on-road events."
News of the rise in security costs emerged as it was confirmed more than 40,000 people had registered to become volunteers at the Glasgow games.
Ms Robison said that original planning for the games had "assumed the use of volunteers in safety and security roles which was common practice at that time".
"However, London 2012 demonstrated that using volunteers in licensable security roles requires extensive training and is not suitable, so this will be significantly reduced," she said.
"These improvements have a substantial impact on the budget, but are critical to ensure we deliver an athlete centred, sport focused games that everyone can enjoys safely."
The sports minister said that the new Chief Constable of Police Scotland Steve House had agreed to take on responsibility for delivering security at the games.
Ms Robison added: "We will not take risks with people's safety - this is the only step to take if we are to deliver a spectacular, safe and secure Commonwealth Games."