The 18 Mexicans arrested in Nicaragua last year while carrying $9.2 million in cash and posing as Televisa employees have been transferred to Mexico, where they will finish serving their sentences on drug and money laundering convictions, the Attorney General's Office said.

The inmates arrived in Mexico on Monday as part of a transfer under the terms of the Treaty between the United Mexican States and the Republic of Nicaragua on the Completion of Prison Sentences, the AG's office said in a statement.

A total of 21 Mexican citizens "who were arrested, prosecuted and sentenced for different crimes, including organized crime, money laundering and drug trafficking, on Nicaraguan territory" were transferred to Mexico, the AG's office said.

The 18 Mexicans arrested on Aug. 20, 2012, "when they tried to enter Nicaragua in six vans, posing as employees of the Mexican company Televisa," were among those returned to Mexico, the AG's office said.

The Mexicans were "prosecuted and sentenced to prison terms of 17 and 18 years in that country, according to their level of participation," the AG's office said.

The group will be housed at federal prisons in Jalisco, Tamaulipas and Nayarit states.

The group of fake Televisa employees, whose suspected leader is Raquel Alatorre Correa, were flown to Mexico from the Managua airport amid tight security, an Efe reporter confirmed.

Nicaraguan prosecutors accused the Mexicans of belonging to a "highly organized" gang involved in smuggling "large amounts" of drugs from Costa Rica to Mexico.

Televisa has denied having any links to the criminals. EFE