A blast at Istanbul's Sabiha Gökçen Airport on Wednesday left a woman dead and another person injured, forcing the authorities to investigate the incident for terror links.

The explosion, the cause of which is not yet clear, killed airport cleaner Zehra Yamac as she suffered injuries to her head. 

The blast occurred at 2 am local time outside the terminal building at the Istanbul airport next to a plane belonging to Turkish private carrier Pegasus Airlines, according to Hurriyet Daily News.

"An explosion whose cause remains undetermined took place on the apron of Istanbul Sabiha Gökçen Airport at 2:05 am on December 23, 2015. Two fellow janitors who were inside a Pegasus aircraft at the time of the incident were wounded in the explosion and transferred to a hospital," Pegasus Airlines said in a statement. 

There was no passenger on the plane. 

While most reports said there was only one blast, the Turkish daily cited witnesses claiming they heard as many as three explosions. 

The Turkish police are investigating the incident. 

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