Toyota Motor Corp said on Wednesday its operations near the Chinese port of Tianjin will remain closed at least until Sunday, extending a suspension originally set through Wednesday, due to safety concerns after last week's deadly chemical explosions in the area.

Toyota also said Sichuan FAS Toyota Motor Co, a joint venture, would close its Changchun plant in northeast China through Friday because the port disaster had delayed custom clearance of parts shipped from Japan. It will make up for lost output by scheduling substitute production days.

Toyota, which operates two assembly lines near the Tianjin port and another line in a different part of the city, said it had not yet been able to confirm that the sites were safe. The Chinese government has said there were about 700 tonnes of the deadly chemical sodium cyanide in the warehouse that blew up.

“Since we have been unable to confirm the safety of the area in the vicinity of the blast, we have decided to keep production offline,” the company said in an email.

Toyota will halt operations through Saturday and remains unsure when they will resume, a company spokeswoman said. The affected plants are usually closed on Sundays, she added.

Automakers are struggling to assess the long-term cost of last week's massive explosions, which killed at least 114 people and indefinitely disrupted operations at China's main car import terminal. Toyota said at least 67 employees have been injured.

Volkswagen AG, BMW AG and Subaru-maker Fuji Heavy Industries Ltd have moved to switch to Shanghai and other ports.

Toyota is also likely to divert shipments to the Shanghai and Dalian ports, a senior Beijing-based company executive said.

Before the blasts, the Tianjin port handled about 40 per cent of the country's imported cars, according to research firm IHS Automotive.

A prolonged halt of operations in Tianjin can be potentially costly for the world's second-biggest automaker, which produced 432,340 vehicles at the city's three assembly lines last year, according to IHS. It estimated a production loss of 2,200 cars per day as a result of the explosions.

This could hurt Toyota's sales in China, which have remained robust even as rivals struggle. The Chinese auto market has been shrinking on the country's slowing economic growth and a recent stock market slump. - Reuters