The Swiss Turkish Society (ITT) announced on Friday that a bomb had been found in the centre's mailbox in the northern region of Rumlang.
Seref Yildiz, head of the ITT, which comprises all Turkish civil organisations in Switzerland, told Anadolu Agency: "They placed a bomb in the mailbox yesterday. I noticed that the box was open, and I called the police immediately because I was suspicious."
Yildiz, who was forced to change his residence because of attacks planned by supporters of the Kurdistan Workers' Party (PKK), said that the police had told him that the bomb was real and ready to explode.
He stressed that the police had taken the case very seriously, cordoned off the area and completely evacuated the building.
The ITT chairman called on the Swiss authorities to find the perpetrators and bring them to justice as soon as possible, stating that his new residence is unknown due to the threats he has received on several occasions.
Yildiz stressed that the centre would continue its usual activities without any delay for the sake of the Swiss Turkish community's prosperity.
The last few months have witnessed several attacks by PKK supporters against headquarters and institutions belonging to the Turkish community in Switzerland.
On 17 March, Yildiz's house was attacked for the fifth time in the last two years by PKK militants, forcing him to move to another residence to protect his children.