The preliminary investigation by the city crime branch into the suspected suicide of Anuj Thapan (26), an accused in the firing incident at Salman Khan’s Bandra mansion, has uncovered carelessness on the part of the guard stationed inside the Mumbai Police headquarters lockup. A careful review of CCTV footage from the two cameras inside the lockup an hour earlier shows Thapan restlessly pacing for about 40 minutes on the balcony before entering the lavatory, where he reportedly hung himself with a rug thread on Wednesday.