Beijing, March 23 -- The death toll climbed to 64 in one of the worst industrial accidents of China in recent times which knocked down buildings, tossed children into air and caused a tremor equivalent to a magnitude-3.0 earthquake, officials said Saturday.

The officials said that 24 others were missing.

The explosion occurred after a fire in the fertilizer factory in Jiangsu province on Thursday, according to the government of Xiangshui county.

Thirty-four people were in a critical condition and 73 seriously injured, state-run China Daily reported.

The death toll is expected to rise as several people have been critically injured.

Over 640 people were injured in the incident.

More than 3,000 workers and around 1,000 residents have b...