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An entire nation is in mourning following one of the deadliest attacks in Mexico’s recent history.

A group of gunmen entered the Casino Royale in Monterrey in broad daylight and set it on fire killing at least 53 people.

About 80 people were inside the casino at the time of the attack.

Surveillance video shows several people running for safety but most died in the blaze.

Survivors said many people fled the attackers by hiding in bathrooms and other areas where they were ultimately trapped by the flames and debris.

Police blame one of the drug cartels but haven't specified which one.

Mexican President Felipe Calderon pledged to find whoever was responsible.

His government put up a $2.4 million dollar reward for information leading to arrests.

He also pledged even more soldiers to help protect not only Monterrey but all of Tamaulipas and northeastern Mexico.

Speaking to the nation on television, President Calderon also lashed out at the United States for not doing enough to curb demand for illegal drugs and arms trafficking across the border.

Monterrey is just two hours southwest of McAllen.

The industrial city has been at the epicenter of a bloody turf battle between former allies the Zetas and the Gulf Cartel.

Conflicts between the two organizations often play out throughout Tamaulipas and often in border cities across from the Rio Grande Valley.