A North Korean ship has been seized trying to pass through the Panama Canal containing a large cache of hidden weapons which may violate U.N. prohibitions against sending weapons to the unstable Asian nation.

Missiles reportedly “being sent for repair” from Cuba were found buried under large sacks of sugar. None of the weapons were listed on the ship’s manifest which is a violation of maritime law.

The 35 crew members have been arrested on charges of endangering public security by illegally transporting war materials.

The United Nations has issued restrictions against selling or sending weapons to North Korea in response to that nation’s refusal to end its nuclear weapons program. Panamanian officials say the weapons could be a violation of the U.N. sanctions and have asked U.N. officials to investigate.

The Cuban government admitted they were the source of the weapons, including two MiG-21bis fighter planes, but that they were “obsolete” and going to be “overhauled” as part of a “legitimate contract.”