At least 14 people were killed and nearly 500 others wounded in a series of blasts in Thailand's insurgency-hit southern city of Yala, in the most deadly co-ordinated attacks in years in the country.
Militants raided several police bases in the Muslim-dominated south, officials said.
Thailand voted on Sunday under heavy security in violence-plagued snap elections amid boycott calls from the opposition, which forced cancellation of polls in 45 constituencies across the politically polarised country.
Cops believe he is part of a network and announced a reward of 1 million baht (Rs 18 lakh) for information leading to his arrest.
While Iraq and Afghanistan top the Global Terrorism Index 2014 as the most terror-affected nations, India has been ranked number six.