Football fans have been warned against using flares at this weekend's Edinburgh derby.
A supporter was injured when flares were thrown at Tynecastle stadium the last time Hibernian took on Hearts in May.
Police say fans face arrest and a future match ban if caught acting dangerously at the ground on Sunday.
Superintendent Gavin Philip said: "While the vast majority of supporters attending the match will do so in a manner which will allow both them and their fellow supporters to enjoy the event, there are a small minority who are determined to put themselves and others in danger by throwing flares.
"It is only a matter of time before someone suffers a serious injury due to their actions and, as such, we will work with both clubs and stewards to do all we can to prevent such dangerous behaviour.
"An enhanced policing presence will be in place and searches will be carried out on those who are suspected of carrying flares, both inside and outside the ground."
The police have the support of both clubs.
David Southern, Hearts managing director, said: "No right-minded football fan of either club should want to expose their club and its supporters to safety threats and football sanctions. It's really not worth it and we would urge supporters not to take flares to the ground.
"We are confident that we'll be able to put on a great advert for Scottish football on Sunday."
A Hibs spokesman said: "Hibernian Football Club fully supports Police Scotland's stance and cannot ever condone any form of anti-social behaviour at matches.
"The only talking point to emerge from Sunday's Edinburgh derby at Tynecastle should be the 90 minutes of football and we urge all of our supporters to conduct themselves in the appropriate manner."
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