Tuesday 23 May 2017 18:51, UK
Police Scotland says it is carrying out enquiries after flares were lit during Celtic's weekend win over Hearts.
A section of the home crowd unfurled a huge banner and lit flares in the 67th minute, in tribute to the 50th anniversary of their 1967 European Cup win.
A Police Scotland statement read: "We can confirm that enquiries are being carried out following the Celtic v Hearts game at Celtic Park on Sunday 21 May 2017 where pyrotechnic devices were set off during the match.
"We will be working with our partners and the clubs to identify those involved who showed a blatant disregard for the safety of other people in the stadium."
Celtic beat Hearts 2-0 to complete an unbeaten Scottish Premiership season ahead of this weekend's Scottish Cup final against Aberdeen.
Victory at Hampden Park would secure the treble in Brendan Rodgers' first season.
