A small Mexican navy plane on a medical mission crashed Monday near Galveston, Texas, killing at least five people, including a 2-year-old, officials said.

Axar.az informs, citing CBS news, two people were taken to the hospital, the U.S. Coast Guard said earlier. There was no immediate word on their condition. One passenger, a 27-year-old, was uninjured, the Coast Guard said. It was unclear if that person was one of the two who had been taken to the hospital. One person was still missing as of Monday night, the Mexican navy said.

The Mexican navy said the plane had been carrying eight people: four navy officers and four civilians. The U.S. Coast Guard later told CBS News the plane was capable of carrying eight people, but that it wasn't actually clear how many were on board.

Two of the passengers were from the nonrofit Michou and Mau Foundation, which provides aid to Mexican children with severe burns.

The crash took place Monday around 3:17 p.m. local time near the base of a causeway near Galveston, along the Texas coast about 50 miles southeast of Houston.

Mexico's navy said in a statement that the plane was helping with a medical mission and had an accident. It promised to investigate the cause of the crash.

The navy is helping local authorities with the search and rescue operation, it said in a post on X.