The BJP on Monday demanded a probe into the "relations" between Delhi minister Arvinder Singh Lovely and Hardeep Singh (in picture), who along with his businessman brother Ponty Chadha was killed in a shootout at a south Delhi farmhouse on November 17. Alleging wrongdoing, Delhi BJP chief Vijender Gupta also demanded an inquiry into the contract of cluster bus service, an ambitious scheme of the Delhi government, awarded to Hardeep.