Broad petulantly hurled the ball at Test debutant Zulqarnain, then on 22, at the end of the 63rd over on the third day at Edgbaston here on Sunday and hit Pakistan's wicketkeeper, who had not moved from his position, on the shoulder.
The 24-year-old Broad pleaded guilty to a disciplinary charge brought by the match umpires which relates to "throwing the ball at or near a player, umpire or official in an inappropriate/and or dangerous manner."
"The actions of Stuart Broad were unacceptable," Ranjan Madugalle, the match referee, said in an ICC statement issued on Monday after imposing a fine on Broad in the region of 2,000-2,500 pounds (3,187-3,984 dollars).
"I understand the frustrations of a bowler in the heat of the moment but as an international sportsman one needs to control these emotions whatever may be the situation and always respect the opponent," the Sri Lankan added.
"Stuart, by pleading guilty, realised his mistake and I'm sure he will not repeat the same mistake again."
The incident took place shortly after Broad had appealed for caught behind against Zulqarnain, who went on to make an impressive 88, rejected by both South African umpire Marais Erasmus and the Decision Review System.
Both Erasmus and Australian colleague Steve Davis spoke to England captain Andrew Strauss after an incident which saw Broad only half-heartedly apologise to Zulqarnain with a brief wave of his hand.
Pakistan captain Salman Butt, speaking after stumps on Sunday and before Broad had been charged, said "It's not good to see people throwing balls intentionally at others, and not even excusing properly."
Former England captain Nasser Hussain, writing in the Daily Mail on Monday and before Broad's punishment had been announced, said "If you take Stuart's history into account you have to say he has been pushing things to the limit for some time. "
There have been rumblings, particularly in the sub-continent, that Broad has got away with petulance before now simply because his dad Chris (the former England opening batsman) is a referee.
"It was important to nip those rumblings in the bud." Hussain was referring to an allegation by India great Sunil Gavaskar that no action was taken against Broad because of his father's position when he argued with the umpires after being given out following a delayed television review in a Test against South Africa at Centurion in December.
"They (the referees and umpires) forge a good relationship and obviously the umpires are not looking to spoil that by citing the young Broad for a violation of the code of conduct," Gavaskar had said.
Broad's action at Edgbaston was deemed to be a level two offence under the ICC code of conduct, with penalties ranging from 50 per cent to 100 per cent of a player's match fee and/or a suspension of two ODIs or one Test match.
Zulqarnain's knock was the cornerstone of Pakistan's 291 for nine that left them with a lead of 112 heading into Monday's fourth day after the tourists were dismissed for just 72 in their first innings.
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