Democratic Republic of Congo held a second day of voting on Thursday in a chaotic and in some areas violent general election – an unscheduled extension that some opposition candidates and observers say could open the results up to legal challenge.

The presidential and legislative elections across Africa’s second-largest country were derailed on Wednesday by delays in delivering election kits and malfunctioning equipment. People also struggled to find their names on registers, while violent incidents disrupted the poll in other places.

The administration of President Felix Tshisekedi, who is seeking a second term, dismissed criticism of the vote and concerns about its credibility.

“We have had inclusive, peaceful, and transparent elections,” said Giscard Kusema of the presidency’s press team.

The vice-president of the CENI election commission said the electoral process was running much more smoothly on Thursday than the previous day and that provisional results would start to be released from Friday.