Mexican authorities say they have dismantled two kidnapping rings in recent days.

Attorney General Rafael Macedo told reporters Tuesday federal agents arrested 16 people during two raids.

Mr. Macedo said the alleged head of a nearly two decades old kidnapping-for-ransom ring, Liborio Colin Dominguez, and 10 of his associates and family members were arrested Friday.

He said the crime ring, which had been active since 1984, would videotape hostages being tortured and send the tape to the victim's family in an effort to quickly obtain a ransom.

Mexico's attorney general said agents broke up a second kidnapping ring on Sunday, arresting four Colombians and one Mexican. He said the criminal group has ties to drug cartels in Mexico and Colombia.