Amnesty International on Monday reported that a man dragged from his home by Mexican marines more than a week ago remains unaccounted for.

The marines "conducted a night assault without a warrant" on June 5 on a home in the border city of Nuevo Laredo, forcing Jose Fortino Martinez Martinez to get into a military vehicle and then taking him away, according to a communique by the Mexican branch of AI.

Authorities have denied having any knowledge of the arrest or whereabouts of the man, according to Martinez's wife, who has filed complaints with the National Human Rights Commission and Attorney General's Office.

Relatives, accompanied by municipal officials and officials with the AG's office, visited the navy base on the outskirts of Nuevo Laredo, in the state of Tamaulipas, where a guard refused to accept notification of the complaint or to provide any information on the matter.

"The police and the security forces, including units of the army and navy, regularly arrest, without judicial order, in the country's most violent areas, people suspected of having links with criminal organizations," said AI.

"However, according to information received by Amnesty Internatioal, there does not seem to be a clear reason for the arrest of Jose Fortino Martinez Martinez," the organization added.

Therefore, AI asked for an investigation into the "apparent forced disappearance" of Martinez and protection for his family, and it also urged the public to write to the authorities so that they will provide information about the case.

The state of Tamaulipas, which borders Texas, is one of the most violent in Mexico due to the ongoing war among criminal organizations for control of the drug-smuggling routes into the United States.

Since December 2006, the armed forces have been on the front line of the anti-drug fight, a situation that has brought complaints and criticism regarding human rights abuses.