Khalid had sought bail on grounds that he neither had any criminal role in the Delhi violence nor any "conspiratorial connect" with any other accused in the case.
Foreign delegates will be provided foolproof security by the Delhi Police during the prestigious summit
The graffiti appeared at more than seven stations and near a government school as well.
As part of its investigation, the SIT has questioned more than 180 people, the Delhi Police officials said.
As per the FIRs, Singh allegedly attempted to coerce one wrestler into sexual acts by offering to provide her with 'supplements' and invited another wrestler to his bed and hugged her.
The officer said the route taken by the accused while fleeing the crime scene has been established.
Sahil brutally killed the 16-year-old girl Sunday evening by stabbing her over 20 times and bludgeoning her to death with a cement slab.
Delhi Police cleared the sit-in site of the protesting wrestlers at Jantar Mantar after a march to the new parliament building ended up in a scuffle.
The Delhi Police had beefed up security at Jantar Mantar following protesting wrestlers' call for a 'Mahila Samman Mahapanchayat' before the new Parliament building on Sunday.
Awaiting his trial, Khalid has been behind bars since September 2020 for his alleged involvement in the larger conspiracy over the communal violence in February 2020.