Captain Leon Alla, a defence front man for Ouattara, said pro-Ouattara forces took control of Bouafle early on Wednesday and Sinfra on Tuesday.
Heavy gunfire was heard early on Wednesday in Bouafle, which is midway between the cocoa producing hub of Daloa and the country's capital Yamoussoukro.
Residents of Tiebisso, 40km north of the capital, also reported fighting.
"Since about 6 o'clock this morning, we are hearing gunfire in Bouafle," Alain Zagole, a resident of the town,
told the Rooters news agency by phone.
"Machine gun fire and often heavy detonations. It is as if there are festivities," he said.
Military campaign
Thousands of people continue to flee the country due to the heavy fighting
... as opposed to the more usual light or sporadic fighting...
following November's contested elections.
In the past few days, forces loyal to Ouattara have stepped up their military campaign - moving from their strongholds in the north into the government-controlled south.
Earlier this week, they reportedly seized the towns of Daloa, Bondoukou and Belleville and were fighting for the town of Duekoue.
Marco Oved, a freelance journalist in Abijdan, said the seizures represent rapid victories for pro-Ouattara forces against fighters loyal to
Laurent Gbagbo... President of Ivory Coast since 2000. Gbagbo lost to Alassane Ouattara in 2010 but his representtive tore up the results on the teevee and Laurent has refused to leave despite the international community's hemming, hawing, and broad hints...
, the country's incumbent leader who has refused to step down.
"They've moved hundreds of kilometres often from the west into the centre of the country, and the east into the centre," he told Al Jizz.
Pro-Ouattara forces
The pro-Ouattara forces, which Ouattara has recognised as his military and renamed the Cote d'Ivoire Republican Forces (FRCI), have controlled northern Ivory Coast since the civil war of 2002-3.
But Oved said it is unclear how much control is coming from Ouattara himself.
"He distanced himself from these rebel forces for the last eight years. It was only after the election that the rebels rallied to his side," he told Al Jizz.
"Ouattara accepted their support, but was hesitant to have any fighting going on, saying as the legitimately elected leader he didn't want to have to take the country by force. The offensive over the last few days has shown that he feels he has no other options now."
'Barbaric practices'
The latest fighting comes a day after the UN peacekeeping mission in Cote d'Ivoire (UNOCI) released a statement saying forces loyal to Gbagbo opened fire on civilians in Abidjan on Monday, killing about a dozen people.
"With the increase in human rights
...which often intentionally defined so widely as to be meaningless...
violations and barbaric practices, there are grounds for wondering whether president Gbagbo is still in charge of his forces and supporters," Tuesday's statement said.
"UNOCI believes it is imperative to end this spiral of violence by finding a definitive solution to the political impasse which stemmed from the post-electoral crisis."
Gbagbo's camp was not immediately available to comment on the UN statement.
Up to one million Ivorians have now decamped fighting in the main city of Abidjan alone, according to the UN refugee agency. Others have been uprooted across the country and at least 112,000 have crossed into Liberia to the west.
Tuesday's UN report of more civilians killed adds to a tally of 462 confirmed deaths since the crisis begin. Human rights groups say crimes against humanity may have already been committed.
The world body is also investigating allegations that 200 African nationals, from Mali, Burkina Faso, Senegal
... a nation of about 14 million on the west coast of Africa bordering Mauretania to the north, Mali to the east, and a pair of Guineas to the south, one of them Bissau. It is 90 percent Mohammedan and has more than 80 political parties. Its primary purpose seems to be absorbing refugees...
, Guinea and Togo, were killed near Guiglo, southwest of Duekoue.