1991 - Pre-war census puts Mostar's population as 35 per cent Muslim, 34 per cent Croat, 19 per cent Serb, 10 per cent "Yugoslav", 2 per cent other.
April 1992 - War breaks out in Bosnia. Croats and Muslims defend Mostar together against attacks by Serb-led Yugoslav army.
July 1992 - Bosnian Croats, backed by Croatia, form separatist state of Herzeg-Bosnia with Mostar as capital.
Spring 1993 - Muslim-Croat war breaks out. Croats expel Muslims from western Mostar and set up detention camps outside city.
February 1994 - Muslim-Croat truce. Mostar is divided into Croat-controlled western sector and smaller, ruined Muslim-held east. Virtually no Serbs left.
March 1994 - Muslim-Croat federation of Bosnia established under US auspices.
July 1994 - European Union given mandate to administer Mostar and re- integrate Croat and Muslim sectors. First administrator is Germany's Hans Koschnick.
November 1995 - Dayton agreement stipulates abolition of Herzeg-Bosnia and reunification of Mostar through elections to city council.
February 1996 - Koschnick proposes dividing Mostar into six cantons, three Muslim and three Croat, with a large mixed administrative area in city centre. Croats react violently, storming EU headquarters in Mostar.
June 1996 - Elections give Muslim-led coalition narrow majority on city council. Croats reject results and boycott council, claiming fraud at polling stations abroad.
July 1996 - EU declares election valid, saying fraud was too small to affect results. Croats warned to join city council by 4 August or EU will leave Mostar.
31 July - US officials extract Bosnian Croat pledge to abolish Herzeg- Bosnia and set up common institutions with Muslims for governing federation.
2 August - President Franjo Tudjman of Croatia fails to assure President Bill Clinton that Bosnian Croats will join Mostar council.
3 August - At EU-sponsored talks, Bosnian Croats refuse to meet deadline for joining council.
4 August - Negotiations restart after expiry of deadline, but no progress. Carl Bildt, international High Representative for Bosnia, demands more pressure on Tudjman to make Bosnian Croats give in.
5 August - Last-ditch talks in Mostar as EU considers whether to end its mission in the city.