Turkish security sources underlined that the police forces in Istanbul arrested a suspect in an underground metro station in north western Turkey.

He turned out to be a suicide bomber as an explosive belt was found in his possession,

Istanbul security directorate announced Sunday that four suicide bombers came to Istanbul to carry out a terrorist attack therefore security measures were beefed up, according to Turkish Cihan News Agency.

The police forces were monitoring one of the suicide bombers since a long time. He was nabbed and referred to Istanbul security directorate to be interrogated.

Source: MENA