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Press watchdogs, including Reporters Without Borders (RSF) and the Committee to Protect Journalists (CPJ), have urged Bahraini authorities to release Humaidan and dismiss the charges against him.
Humaidan is a winner of the National Press Club 2014 John Aubuchon Press Freedom Award.
In June, Human Rights Watch deputy Middle East and North Africa director Joe Stork said that "throwing photographers in jail isn't going to keep either the protests or the accounts of what happens in Bahrain out of the world's sight."
The tiny but strategic kingdom, just across the Gulf from Iran and home base for the US Fifth Fleet, remains deeply divided three years after authorities crushed the 2011 uprising with Saudi-led military backing.
Persistent protests still spark clashes with the police and dozens of Shiites have been tried over incidents linked to the uprising.
The authorities increased penalties for those convicted of violence last year, introducing the death penalty or life sentences for certain cases.
The International Federation for Human Rights says at least 89 people have been killed in Bahrain since the uprising began in February 2011.