Candidates in 15 constituencies nationwide have been accused of election law violations.

Election Commission secretary-general Pol Maj-Gen Ekkachai Warunprapa said 17 complaints had already been lodged about poll violations involving candidates in 15 constituencies.

Yellow or red cards would be issued to candidates found to have breached the election law.

The EC would speed up inquiries into alleged violations in Krabi, Satun, Songkhla and Samut Prakan provinces, he said. No complaints of poll fraud had been lodged against party-list candidates or political parties.

Inquiries into the alleged cash-for-votes case against Deputy Agriculture Minister Newin Chidchob were continuing. A team of investigators had been sent to question five or six witnesses and gather further evidence in Songkhla's Hat Yai district.

A tape recording of Mr Newin allegedly promising cash to canvassers during a meeting in Hat Yai district on Jan 16 would be sent to the police scientific crime detection unit for examination, said the EC secretary-general.