An ash cloud from new volcanic activity in Iceland grounded flights across Ireland and Scotland on Wednesday.
Dublin Airport canceled flights until at least 4 a.m. local time on Thursday, a move that stranded more than 30,000 passengers, reported the Associated Press. Shannon Airport won’t open until at least 1 p.m Thursday.
In Scotland, Glasgow Airport shut Wednesday morning, but Edinburgh stayed open until midday, though most airlines canceled services there anyway amid widespread confusion, reported the AP.
Glasgow is slated to be shut until at least 1 a .m. Thursday, while Edinburgh was scheduled to reopen Wednesday night.
Ryanair canceled all flights to and from airports in Ireland, Northern Ireland and Scotland on Wednesday.
The U.K.’s National Air Traffic Service said the ash cloud posed no threat to airports in England on Wednesday.