Supporters of Turkish President wave Turkish flag during a ceremony in Ankara on March 27, 2017. (Xinhua/AFP Photo)

ISTANBUL, March 27 (Xinhua) -- The Turkish authorities on Monday launched a probe into a rally in the Swiss capital of Bern that called for the killing of Turkey's President Recep Tayyip Erdogan, local media said.

The Istanbul Chief Public Prosecutor Office is looking into "suspicious people" who opened a banner at the rally organized by the outlawed Kurdistan Workers' Party (PKK) on Saturday in front of the Swiss federal parliament, Turkey's state-run Anadolu Agency said.

The banner included a drawing featuring Erdogan with a gun being pointed at his head under the slogan, "Kill Erdogan with his own weapons."

The suspects are accused of being members of a terrorist organization, insulting the president and making propaganda for a terrorist group, Anadolu noted.

The Turkish Foreign Ministry summoned Swiss ambassador to Ankara on Sunday over the episode, while the Swiss authorities opened a probe the same day into the rally, according to press reports.

The PKK was listed as a terrorist organization by Turkey, the U.S. and the EU.