HARARE, Zimbabwe - Talks on a new constitution disrupted by militants loyal to President Robert Mugabe have resumed.

The conference aimed at drawing up a new constitution collapsed in disarray Monday after Mugabe supporters drowned out the opening ceremony with jeers and revolutionary songs.

Mugabe, who had been scheduled to address the conference Monday, called for "unity across the political divide," state television reported later that evening.

The conference resumed Tuesday with tougher security by police to keep out likely trouble makers.

The disruption of Monday's meeting appeared to be another sign of Mugabe's determination to resist constitutional reforms, which might loosen his grip on the country he has ruled since 1980.