The Blackett Laboratory (home to IC's Physics Department at the South Kensignton campus) has been sealed off by police after a security guard was attacked by a man weilding a machete.
Police were called in earlier this afternoon after a man walked in, off the street and took a security guard hostage, threatening to cut his throat. According to one security guard who spoke to Live! the man was a "nutter". He claimed to be a soldier and repeated told police "I am on a mission."
The man was eventually persuaded to let the security guard go and was arrested by the police. However, a detailed search off the building is being conducted with the Physics department sealed until tomorrow morning. The security guard is not believed to have sustained any serious injuries but is being treated for shock (he did have a very big blade stuc under his neck...).