Turkey's Parliament Speaker Cemil Çiçek called Wednesday for closer international collaboration against terrorist organizations.

"Turkey attaches importance to cooperation in fighting terrorism," said Çiçek during his meeting with European Parliament President Martin Schulz at the parliament.

Çiçek said that one country's fight against terrorism was not enough to solve everything, citing incidents taking place in Syria and Iraq.

The speaker stated that these two countries are more vulnerable than ever to terrorism and terrorist organizations, such as ISIS.

Çiçek also said that there were members of the outlawed Revolutionary People's Liberation Party-Front (DHKP-C) and PKK terrorist groups in European countries.

The outlawed DHKP-C was founded in 1978. Purportedly supporting Marxist-Leninist ideology, it was mostly active during the Cold War era, but the terrorist group has revived its attacks in recent years and was involved in carrying out a suicide attack to the U.S. Embassy in Ankara.

Turkish security forces fought against the PKK since the 1980s until a 2013 initiative launched by the government to end a conflict that has claimed the lives of more than 40,000 people.