The April incidents escalated into an armed conflict on 15 April in the area of Vitez, Busovača, Kiseljak and Zenica. The outnumbered HVO in the Zenica municipality was quickly defeated, followed by a large exodus of Croat civilians.
On 16 April, the HVO (The Croatian Defence Council) launched a spoiling attack on the village of Ahmići, east of Vitez. After the attacking units breached the ARBiH lines and entered the village, groups of irregular HVO units went from house to house, burning them and killing civilians.
In April 1993, Biden spent a week in the Balkans and held a tense three-hour meeting with Serbian leader Slobodan Milošević. Biden related that he had told Milošević, "I think you're a damn war criminal and you should be tried as one".
On 24 April, mujahideen forces attacked the village of Miletići northeast of Travnik and killed four Croat civilians. The rest of the captured civilians were taken to the Poljanice camp.