A company in suburban Shanghai that supplies accessories for Apple is facing the "harshest penalty" for discharging pollutants into rain pipes, which has caused severe pollution, environmental authorities said Thursday.

The section of river polluted has returned to normal.

RiTeng Computer Accessory Co., Ltd. was recently found to have dumped waste fluid into a drainage system, polluting a river in Shanghai's Songjiang district.

The company, a subsidiary of Taiwan's Pegatron Corp., was also found to have made excessive noise, handled waste improperly and had insufficient environmental protection warrants.

The environmental protection bureau of Songjiang has ordered the company to seal off its discharge outlet and clear any waste remaining in the drainage network.

Some of the company's production was correspondingly halted, according to the local environmental authority.