Court summons mayor, 21 other accused on October 27
JIT formed to determine role of LEAs, governments and political parties
Bench also directed to form a judicial tribunal
Petitioner also asked the court to cancel permission granted to hold rallies on May 12
Petitioner has accused Gen (retd) Musharraf of being responsible
MQM leader was CM's adviser on home affairs at the time
Lawyers observe black day over Karachi killings during Emergency Plus.
The accused is also allegedly involved in the murder of an MQM MPA