The Azimio leaders who had been arrested on Monday are expected to appear in court on Thursday.
The leaders including Ugunja MP Opiyo Wandayi, Kilifi Senator Stewart Madzayo, Amina Mnyazi (Malindi) and Richard Chonga (Kilifi South MP) were arrested while leading demonstrations in Nairobi.
They had stormed the Kenyatta International Convention Centre (KICC).
Soon after their entrance, they were dismissed by police officers who hurled tear gas canisters at them.
They were kept at Kiambu Police Station until late evening when they were released.
Taking to his Twitter account, Wandayi revealed the court date as he thanked the Azimio fraternity for their prayers.
He however did not give any details as to why they are being taken to court.
"I have been released after day-long detention with colleagues and we are due to appear in court on Thursday. Thank you for your agitation and prayers," he tweeted.
Speaking shortly after their release, the MP said it was unfortunate that the Kenya Kwanza government was using the police to settle political scores.
He added that the issues that Kenyans are raising through street protests can never be swept under the carpet.
"Regardless of how many times you arrest people or leaders, the issues being raised out there will continue to be raised and it doesn't matter what kind of force or intimidation is applied," he said.
