Ministers Arvinder Singh Lovely and Haroon Yusuf were accused by Delhi BJP chief Vijender Gupta of having links with Chaddha's brother, who was killed in firing last month here.
Gupta alleged that Lovely had links with Ponty's brother Hardeep.
"This whole issue is like a spider web. Its unacceptable that no investigation will be done on it," Gupta told reporters here demanding immediate resignation of both Lovely and Yusuf till the probe is on.
He alleged there was collusion between Lovely and Hardeep in the case of contract for cluster bus service in Delhi.
Gupta also cited a media report which talked about telephone calls the ministers allegedly made to Hardeep.
He said BJP will stage a protest tomorrow demanding probe into the ministers in connection with this. He said the party MPs would raise the issue on December 17 in Parliament.
"The Delhi police has not taken any of these people for investigation and if they have, then police must bring it forth," Gupta alleged.
