Referees' body Professional Game Match Officials Limited (PGMOL) says it is appalled by the “unjustified and abhorrent” abuse directed at Anthony Taylor in Budapest Airport following Wednesday's Europa League final.
The Englishman had officiated the game, where Sevilla beat Roma on penalties after a 1-1 draw.
Taylor and his family were then shouted at by angry fans at the airport.
PGMOL said in a statement: “[We are] aware of videos circulating on social media showing Anthony Taylor and his family being harassed and abused at Budapest Airport.
“We are appalled at the unjustified and abhorrent abuse directed at Anthony and his family as he tries to make his way home from refereeing the Uefa Europa League final.
“We will continue to provide our full support to Anthony and his family.”
Meanwhile, Uefa is waiting for reports from match officials and delegates before deciding whether to take action against Mourinho with regards to the separate incident in the car park under the stadium after the match.
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Mourinho criticised Taylor in his news conference and he was later captured ranting and making pointed comments as Taylor and officials were boarding a minibus.
The Portuguese repeatedly swore and twice shouted about a “disgrace” before talking in Italian.
Uefa's chief refereeing officer Roberto Rosetti attempted to calm the situation down.
Mourinho was booked during an ill-tempered game, with Taylor repeatedly called to the benches to take action as fourth official Michael Oliver struggled to keep control.
Taylor issued yellow cards to 13 players, the most bookings in a Europa League game. Seven of them were to Roma players, a record for a final.
Delays and injuries saw more than 25 minutes of injury time played across the four halves of the game, which went to extra time and then a shootout.