Hearts 0 Celtic 3:The Scottish football authorities have promised to investigate the incident which saw Celtic manager Neil Lennon attacked by a fan during tonight's SPL match against Hearts at Tynecastle. Reacting to the incident, Scottish Football Association chief executive Stewart Regan condemned the attack.

Lennon was approached by the fan after Gary Hooper had put the visitors two goals ahead in a game Celtic went on to win 3-0. Before the game could restart a fan clambered from the Hearts section of the main stand and made a beeline for the Celtic boss who was on the touchline, leading to an intervention by police and stewards after the fracas ended and the supporter was taken away by police.

Trouble ensued in the Celtic section of the stadium with fans appearing to fight with police and stewards.

Regan said: “Clearly this kind of behaviour from supporters is wholly unacceptable. The safety of players, club officials and match officials is paramount on or around the field of play, and this clear breach of security is a matter I will be discussing with SPL chief executive Neil Doncaster tomorrow.”

Lennon has been in the headlines regularly this season for incidents on and off the field. He was involved in a controversy in November over a rejected penalty claim — against Hearts at Tynecastle — for which he later received a touchline ban for his comments.

In January a package addressed to him containing bullets was intercepted at a sorting office in Country Antrim. In March, the club confirmed Lennon was under 24-hour security surveillance after a suspicious package was intercepted at a Royal Mail sorting office in Ayrshire. On April 19th it emerged that Royal Mail intercepted a total of two “viable” parcel bombs addressed to Lennon.