Karabakh is internationally recognised as part of Azerbaijan but populated mostly by ethnic Armenians who broke away in the 1990s in the first of two wars there since the collapse of the Soviet Union.
Karabakh authorities said more than 50,000 had left so far, out of an estimated ethnic Armenian population of 120,000.
Azerbaijan rejects Armenian accusations of ethnic cleansing, but images of tens of thousands of desperate people on the move have provoked widespread international alarm.
Germany added its voice to U.S. calls for Azerbaijan to allow international observers into Karabakh.
Karabakh authorities said they lost at least 200 people in Azerbaijan's offensive last week.
Persons:
Ruben Vardanyan, Veronika Zonabend, Morris Tidball, Binz, Annalena Baerbock, Matthew Miller, Washington, Irakli, Ilham Aliyev, Zonabend, Miller, Vera Petrosyan, Daphne Psaledakis, Mark Trevelyan, Gareth Jones, Philippa Fletcher, Alison Williams
Organizations:
Twitter, U.S . State Department, REUTERS, Reuters, Local, Russian, Russia, State, Washington, Thomson
Locations:
Azerbaijan Karabakh, Germany, GORIS, Armenia, Nagorno, Karabakh, Azerbaijan, Baku, Soviet Union, Kornidzor, Russia, Ukraine, Caucasus, Turkey, Iran, United States, Washington