Jha was detained by the police while he was proceeding to stage the planned hunger strike outside Mishra's residence. He was taken to Sarai Rohilla police station.
Jha has demanded that Mishra come clean on the claim that he saw Health Minister Satyendar Jain pay Rs 2 crore to Kejriwal.
In an "open letter" to Kejriwal, Mishra, whose hunger strike entered the fourth day, again pressed for divulging the details of foreign tours undertaken by five leaders of the party.
"You (Kejriwal) made a strategy to use MLAs as a shield. However, only one MLA came forward to be that shield?" Mishra said, adding that his next "expose" would be tomorrow.
More From This Section
Earlier in the day, Jha who is an MLA from Burari, went to Rajghat, Mahatma Gandhi's memorial, to "seek blessings".
"On May 7, Kapil Mishra had said that Arvind Kejriwal had met Satyendar Jain where he paid him Rs 2 crore. My question to him is at what time did he meet the chief minister. Which car did he use? I have the entire day's video footage (of people entering Kejriwal).
Mishra hit back at Jha with another "open letter" and "advised" him to drink lots of water during the hunger strike.