UPDATE 3-Spain's OHL first-quarter net profit drops on Mexico hit
* Net profit drops 18.7 pct, core profit slips 5.4 pct
* Mexico motorway business weighs on results
* Peers FCC and Abertis see profit growth in Q1 (Adds quote by source)
By Julien Toyer
MADRID, May 13 (Reuters) - Spanish infrastructure group OHL posted an 18.7 percent drop in first-quarter net profit on Wednesday, hit by a lower contribution from its motorway business in Mexico where the firm is investigating allegations about overcharging the government.
Shares in OHL Mexico have fallen 20 percent since recordings appeared on YouTube in which executives are heard discussing overcharging for public works.
The company has launched an investigation into the matter, but says it has not acted illegally and that the recordings were edited to distort their content.
Separately, a source close to Mexico's securities regulator CNBV said on Wednesday the agency had launched a review of OHL Mexico's disclosures to the country's bourse due to the disclosure of the recordings.
"The CNBV began a review ... too see if (OHL) complied with minimum information requirements to investors," said the source, who declined to be identified because the matter was not public. Continuación...