The leader of Lebanese Shiite movement Hezbollah, Hassan Nasrallah, is a "terrorist" who must be stopped, Bahrain's foreign minister said on Sunday.

"Terrorist Nasrallah has declared war on his nation," said Sheikh Khaled al-Khalifa on his Twitter account.

"Stopping him and rescuing Lebanon from his grip is a national and religious duty for all of us," he said.

The minister's remarks come a day after Nasrallah explicitly acknowledged his forces were fighting in Syria against the opposition which is bidding to oust President Bashar al-Assad's regime.

Nasrallah vowed that he will bring victory in the fight aimed at rescuing the Syrian leader.

Sunni-ruled Bahrain with a Shiite majority has repeatedly described Hezbollah as a terrorist organisation and called to blacklist it.

Bahrain has been battling a Shiite-led protest that began in February 2011.

A total of 80 people have been killed since the protests erupted, according to the International Federation for Human Rights.