An extra 1,000 extra police have been placed on duty this weekend in Glasgow, where the Old Firm derby between Rangers and Celtic should decide the Scottish Premier League title race. The move comes as detectives hunt for those who sent parcel bombs to Celtic manager Neil Lennon and two other men.

Lennon said the threats would not stop him from managing Celtic.

"I've had this for 10 years," he said, "but I don't want to say you get used to it, because you never do. It's been with me during my time as a player, my time as a coach and my time as a manager. But it is not going to deter me from doing what I want to do. For me this is the greatest privilege in my life, to manage this football club, and the support I've had from the fans and my close family and friends has been my strength."

Outgoing Rangers manager Walter Smith has since been warned that he might also be targeted in the latest round of sectarian threats surrounding the Old Firm rivalry.

"In the 20 years I've been involved, and being from the west of Scotland," said Smith, "I've never known a week quite like this. It's sad."