"I have been busy attending a function of Arya Bhat Law University and later a meeting of the Cabinet. I have come to know about the events from you and will collect information about it," Kumar told reporters here.
Sources in the CMO said that Kumar would leave for Delhi tomorrow.
Earlier, in the day 13 of the 22 RJD MLAs wrote a letter to Speaker Uday Narayan Chaudhary informing him that they were quitting their party.
Prominent rebel leaders Samrat Chaudhary and Javed Iqbal Ansari criticised Lalu Prasad for playing into the hands of the Congress and praised Nitish Kumar for severing ties with BJP over Narendra Modi's elevation.