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Sudanese demonstrators answered calls from protest leaders and showed up in large crowds at rallies across the country on Thursday amid deadlocked negotiations with the ruling military over its handover of power.

Many gathered outside the military headquarters in Khartoum into the evening, chanting slogans.

The Sudanese Professionals' Association (SPA), which has spearheaded four months of protests that drove Omar al-Bashir from power in April, also called for a "million man march" outside the army headquarters in the capital.

One of the protesters said the march was being organised to send a message to the ruling military that the protests won't stop until the military hands over power to a civil-led authority.

The protesters want to denounce the ruling generals' resistance to relinquish power to a sovereign council that both sides had already agreed should lead the country during the transitional period.

There are also indications that the SPA, a union umbrella, may call for a general strike.

The two sides have held several rounds of talks since the military overthrew al-Bashir on 11 April, ending his 30-year reign.