More details are starting to become available on the deadly small aircraft crash early this morning near the Pavas, San José airport which affected six individuals.

However, Nature Air, who operated the flight, said they were not making public statements on the event due to the fact that the crash is under investigation by the Civil Aviation Department.

A woman identified as Costa Rican María Elena Umaña died of cardiopulmonary arrest – a heart attack – during the crash into the Torres River on a flight operated by local carrier Nature Air, according to Red Cross information.

The other five passengers were transferred to three of the city’s major hospitals for treatment and evaluation. Two of these are U.S. citizens Randall Lindner and Keith Putbrese.

Also being treated are Costa Ricans Cristian Mendez, the pilot, and passengers Esteban Cubero and Alejandro Cardona.

The Costa Rican Social Security Agency (CCSS, its initials in Spanish), which runs the country’s public healthcare system, has provided preliminary reports on the medical status of the five passengers and pilot.

Keith Putbrese (46) is preliminarily identified as hailing from Oklahoma by the Mexico Hospital’s press office. He was admitted this morning in critical condition and is being treated for trauma to the head and chest, and burns, said Gerald Montero, CCSS press officer.

No further individual information is available on the injured passengers. The four other individuals were said to be in stable condition.

Domestic carrier, Nature Air, recently has gone through some internal turmoil with staff changes and problems with aircraft rental contracts which in July caused them to have to forego service on several flights.

Aerobell, the company whose plane was involved in the crash, said they did not have a press contact at present for comments.

For the most recent updates on the accident please click here