A second man has died from clashes in Bahrain, as he participated in the funeral procession of a protester killed during recent unrest in the country.

Fadhel Matrook was among thousands of people who went to a hospital Feb 15 morning for the funeral procession of Ali Abdulhadi Mushaima, who died the day before after being shot in the back, according to Nabeel Rajab, president of the Bahrain Center for Human Rights.

As some were exiting the hospital, security forces shot at them with guns typically used for killing birds - not humans. Matrook, 31, was killed, Rajab said.

Bahrain's interior ministry said on its website that an investigation has been ordered to find out the reason behind the incident.

Protesters who have organized on Facebook, Twitter and with e-mails want political reforms, including a constitutional monarchy.

Bahrain hosts the headquarters of the U.S. Navy's Fifth Fleet, CNN reported.