(UPDATE 17:25)

Fredolin Lecari, the chief of Border Police declared that the airplane was detained and the persons who were on board have been interrogated. The border police is at the place of the incident.

On the web-site of BueBird Airways we found out that the company has many routes to Bucharest.

The call-center operators of this company don't know any information about what happened.

(UPDATE 17:23) 

According to the border police, three persons that didn't belong to the staff were on board. 

An airplane illegally entered the air space of the Republic of Moldova and illegally landed on Chisinau International Airport. 

This information was confirmed by the Civil Air Authority.