As a SEN, LH did the same thing to me in Tunis. Inbound flight was cancelled because it didn't leave before the airport closed. So at 11pm I find out that my 2am flight is cancelled. They said since I was getting a 2pm flight, no hotel was offered (same "day" travel) and no compensation because it was force majeur. Which it wasn't. The airport curfew had changed in September and this was Feb! They had already adjusted their schedules because of it. I just cut my SEN in two and sent it back.
EC261 covers the EU, Iceland, Norway and Switzerland airlines too.