PORT-AU-PRINCE, Haiti  The police in El Salvador have begun an investigation into whether a man suspected of leading a trafficking ring involving Central American and Caribbean women and girls is also a legal adviser to the Americans charged with trying to take 33 children out of Haiti without permission.

When the judge presiding over the Haitian case learned on Thursday of the investigation in El Salvador, he said he would begin his own inquiry of the adviser, a Dominican man who was in the judge’s chambers days before.

The inquiries are the latest twist in a politically charged case that is unfolding in the middle of an earthquake disaster zone. A lawyer for the group has already been dismissed after being accused of trying to offer bribes to get the 10 Americans out of jail.

The adviser, Jorge Puello, said in a telephone interview on Thursday that he had not engaged in any illegal activity in El Salvador and that he had never been in the country. He called it a case of mistaken identity. “I don’t have anything to do with El Salvador,” he said, suggesting that his name was as common in Latin America as John Smith is in the United States.