Photo: Xinhua

An initial report of the Ukraine plane crash in Tehran was released by the investigating team on Wednesday, disclosing details of the incident, revealed Iran's state television. The initial evaluation indicates the existence of a technical problem. 

Ukraine is looking at various possible causes of the crash, including a possible missile attack, a collision, an engine fire, explosion and terrorism, Secretary of Ukraine's National Security and Defense Council Oleksiy Danilov said on Thursday.  

"Ukrainian investigators want to search for possible debris of a Russian missile at the site of the Iran plane crash after seeing information about it on the internet," Danilov added.  

Ukraine has sent a group of experts to Tehran to examine the circumstances of plane crash, according to Ukraine's National Security and Defense Council. 

The report shows that the plane disappeared from the radar when it reached an altitude of 8,000 feet (approx. 2,400 meters) and then crashed on the ground.

The pilots didn't receive any messages related to abnormal situations, the report says. 

According to witnesses at the scene, the plane first caught fire and then exploded when it hit the ground. 

The route of the plane shows that the aircraft was heading west upon departure, but then took a right turn when the technical issues started. The aircraft was on its way back to the airport before it fell.