BRIEF-Spain's OHL falls sharply on concerns over Mexico unit
May 7 (Reuters) - Obrascon Huarte Lain SA :
* Shares fell 8 percent to 18.55 euros at 0711 GMT after shares in its Mexican unit closed down nearly 12 percent on the Mexican stock exchange on Wednesday
* Shares of the Mexican unit fell after the release of recordings that appeared to show executives discussing overcharging the government but which the company dismissed as a montage. Further company coverage: (Reporting By Paul Day; Editing by Julien Toyer)
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