Blackburn's Grant Hanley (right) was one of eight players to be booked
Blackburn Rovers and Bolton Wanderers both remain without a win so far this season after an uninspiring goalless north-west derby at Ewood Park.
Blackburn's Jordan Rhodes twice headed wide during a first half in which neither side managed a shot on target.
Bolton substitute Emile Heskey's shot on the rebound was blocked on the line by Rovers defender Shane Duffy late on.
Wanderers' Dorian Dervite was then sent off for a second bookable offence in stoppage time, but Bolton held on.
Neil Lennon's side have now failed to score in any of their last four away league games, stretching back to 18 April.
More to follow.