Thaksin said any elections held under the new constitution will deny the will of the majority of the people.
At 7 pm on Monday, a bomb went off at the Erawan shrine in central Bangkok, killing at least 18 and leaving more than a hundred injured.
The participants were the country’s political rivals, four Cabinet ministers from the embattled government, election commissioners and senators.
The US expressed concern and called for restraint from violence in the face of mass anti-government demonstrations.
Due to the protests, Thai Imports fell by 15.5 per cent in January from a year earlier, the biggest tumble since October 2009.
The anti-government protests have already taken a toll on the economy, tourism in particular, with arrivals in Bangkok sharply down.
Thai protestors want the government to hand over power to an unelected people’s council to implement reforms needed to end corruption.
The elections earlier this week are unlikely to lead to a resolution of Thailand’s political crisis.
Yingluck has been out meeting those supporters over the past week.
Thaksin lives in Dubai to avoid a jail sentence for a corruption conviction he says was politically motivated.
King Bhumibol Adulyadejhas often served as a unifying figure in times of crisis.
Violent clashes took place near Yinglucks heavily fortified offices.
Fighting intensified after anti-government protesters attacked a bus they believed was full of government red shirt supporters.
Three especially sensitive districts of the capital have been under the law since August.
More than 1,000 people blew whistles and temporarily halted traffic in Bangkoks financial district of Silom.