By Mubasher Bukhari LAHORE (Reuters) - Survivors trapped in the rubble of a collapsed Pakistani factory pleaded for help on their mobile phones on Thursday even as rescuers said they feared the death toll of 18 could rise in the latest tragedy to spotlight poor safety standards in south Asia. "We were working on the first floor when the roof collapsed," said one of the trapped workers, Liaqat Ali, who used his mobile to talk to a television station. "The factory owner had an exchange of harsh words with the contractor who had advised him to stop the work due to cracks appearing after the earthquake," Muhammad Ramzan, a worker trapped under the rubble, told rescue officials by telephone.



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