It may have been controlled due to Agitation in ECR. I just checked, Agitation has been finished nd train operation started. 12303 Poorva arrived Patna Jn now..
NCR was controlling PNBE side trains.
LTT-PNBE, Pune-Danapur, Bandra Terminus-Saharsa Humsafar, Seemanchal, NorthEast, Mahananda were detained in NCR itself.