Sudan's military and a powerful paramilitary force battle fiercely in the capital and other areas, causing more than 650 casualties while dealing a new blow to hopes for a transition to democracy.
Despite humanitarian pause, heavy gunfire could be heard in central Khartoum near the airport, and dense black smoke billowed from the surrounding area.
The strike is likely to add to problems in a sector that regularly faces jet fuel shortages, which often ground local flights and where international carriers struggle to repatriate revenue from ticket sales due to a shortage of foreign currency.
Ghannouchi, a former parliament speaker, earlier said that the accusations against him "lack any real evidence" and seek to divert public attention from Tunisia's real problems.
Fighting in the capital of the chronically unstable country is unprecedented and could be prolonged, despite regional and global calls for a ceasefire as diplomats mobilise.
The eruption of violence follows tensions between military leader Abdel Fattah al Burhan and paramilitary commander Mohamed Hamdan Daglo over the planned integration of paramilitary forces into the regular army.
