MEXICO CITY — Dominican authorities announced Friday that they arrested Jorge Torres Puello, who acted as a legal adviser for a group of American church members detained in Haiti on child abduction charges even though he himself was wanted on trafficking charges in the United States and El Salvador.

Working together with the United States Marshals Service and other United States law enforcement agencies, the Dominican authorities detained Mr. Torres Thursday night without incident in the parking lot of a McDonald’s restaurant in Santo Domingo, the officials said.

Mr. Torres, who used a variety of aliases and falsely described himself as a lawyer, dropped out of sight in February after The New York Times asked him about trafficking charges against someone with a similar name and likeness in El Salvador.

In El Salvador, Mr. Torres is wanted on accusations of human trafficking and exploitation of minors for pornography and prostitution. In the United States, he faces accusations of alien smuggling in Vermont and of probation violations for fraud in Pennsylvania. He is also wanted in Canada, American officials said.