ZHANGZHOU, China - A blaze at a chemical plant in east China's Fujian Province resurfaced for a second time on Wednesday morning, several hours after it was reportedly extinguished.

The fire, which had been put out by 11:40 p.m Tuesday night nearly 21 hours after it started, was seen flaming once again at around 2.09 am local time (2.09 am Singapore time), Xinhua reported.

More than 170 fire engines were despatched to battle the blaze.

The fire started after oil leaked at the Dragon Aromatics facility on the Gulei Peninsula at around 6.50pm on Monday, initial investigations found. It was the second explosion at the plant in two years.

Six people were sent to hospital for injuries, and another 13 people sustained minor injuries, CCTV reported.

Provincial and city environmental officials said there were no signs of contamination from the blast in surrounding waters or villages downwind.

However, about 400 Gulei residents were relocated to nearby areas. An employee at the Dongshan Haiyue Hotel in nearby Tongling township told the South China Morning Post that residents from the peninsula had booked into the hotel.