Last night's European ties - including Liverpool-Boavista - went ahead (GaryMPrior/Allsport)

There was supposed to be a full schedule of ties in the Champions League tonight and the UEFA Cup on Thursday involving both English and Scottish clubs.

Manchester United's players are already in Greece to take on Olympiakos, while Celtic host Rosenborg this evening. Tomorrow's UEFA Cup games see Leeds play Maritimo in Madeira, while Chelsea, Ipswich, Aston Villa and Kilmarnock all have home ties.

Hibernian are set to take on AEK Athens in the Greek capital on Thursday, while Rangers have had an appeal against the decision to play their game with Anzhi Makhachkala in Dagestan rejected by the Court of Arbitration for Sport.

'The scale of this tragedy and the pain and sorrow which it brings should cause us all to reflect,' said UEFA chief executive Gerhard Aigner in a statement.

'UEFA feels it is right that the European football family should respect the loss and suffering now being felt by those families who have lost their loved ones by postponing all UEFA games scheduled to be played this week.'

'On behalf of UEFA I would like to send our condolences and deepest sympathies to all those who are in pain as a result of these terrible events.

'We will convey this in a formal message to the US Embassy in Geneva.