On 14 September 1992, the Constitutional Court of Bosnia and Herzegovina declared the proclamation of Herzeg-Bosnia unconstitutional. The Croatian Community of Bosnian Posavina was formally joined into Herzeg-Bosnia in October 1992. Throughout late 1992, tensions between Croats and Bosniaks increased and in early 1993 the Croat–Bosniak War escalated. Clashes spread in central Bosnia, particularly in the Lašva Valley. Within two months most of central Bosnia was under ARBiH control.