The latest court hearing of Nabeel Rajab, the head of the Bahrain Human Rights Centre, has been adjourned on Wednesday until 5 August, Human Rights activist Said Yousif reported on his twitter account.

The court was expected to rule on Rajab's appeal against his three-month prison sentence on libel charges related to a post he made on Twitter. His appeal hearing was already postponed on 18 July.

The adjournment comes as Amnesty International called for the immediate release of the prominent rights activist on Monday.

"Bahrain must release all prisoners of conscience immediately and without conditions [...] ahead of appeals" Amnesty International said on Monday.

The head of the Bahrain Centre for Human Rights was arrested on 10 July by masked men in balaclavas and plain clothes after he was convicted to three month in prison for sending defamatory and libellous tweets from his twitter account.

Nabeel Rajab has more than 158, 000 followers on the popular micro-blogging website.

His lawyer, Mohammed Al-Jishi, said that they would normally expect a fine if someone was found guilty in such a case.
Nabeel has already spent 3 weeks in prison related to the charges and has been arrested multiple times.

The rights group also called for the release of nine medical workers who have been summoned to appear before the Court of Cassation in the capital Manama on 30 July. Their convictions were upheld on appeal in June for their role in anti-government protests last year.