The death toll in the fire at Tamil Nadu firecracker unit rose to 20 as one more person succumbed overnight to his injuries, officials said on Monday. J Vanaraja, 51, who had sustained 90 per cent burns, succumbed at the Government Rajaji Hospital in Madurai on Sunday night. Two more injured were said to be in critical condition. A massive fire at Sree Mariyammal Fireworks near Sattur in Virudhunagar district on February 12, killing 11 persons and injuring more than 20 others. Meanwhile, officials have identified three more victim women M Poomari, 50, S Sankareswari, 55, and P Malliga, 58. Preliminary police investigations revealed that excess workforce along with illegal sub-leasing of the premises contributed to the disaster. Police has arrested one of the leaseholders, Ponnupandi, and are on the lookout for five others, including the factory owner.