Around 40 family members of firefighters still missing after two blasts ripped through China's eastern port city of Tianjin attempted to protest outside the local city hall.
Holding banners that said "return me my son" the family members, mostly from rural backgrounds, were blocked from entering the courtyard to the city hall by rows of police officers.
The group was trying to ask local government officials where they could find details on their missing relatives.
The family members said information on staff firefighters has made been available to the public, but the government has failed to provide details on the contract firefighters who were sent in to extinguish the fire before the two massive blasts occurred.
After Wednesday's blasts, fire crews were criticised for using water to douse flames, which may have contributed to the blasts given the volatile nature of the chemicals involved.
Media have said such firefighters in China, often only on two-year contracts, lack training as new recruits.
The death toll from the massive explosions has risen to 112 with 95 people missing, the official Xinhua news agency said on Sunday, suggesting the toll could rise significantly.
President Xi Jinping yesterday urged authorities to improve safety and learn lessons paid for with blood.
