Turkish authorities on Friday were investigating suspicious substances or objects at the Canadian , German and Belgian consulates in Istanbul , officials said . Canadian officials reported receiving a letter containing an unidentified yellow substance Friday , Turkey 's semiofficial Anadolu news agency reported . A person who opened the letter was directly exposed to the substance , and six people nearby may have been indirectly exposed , but no one was exhibiting alarming reactions , a representative of Turkey 's emergency management agency said . Chemical , radiological and nuclear experts were investigating the substance , and as a precaution were decontaminating the area and the seven people , the agency said . Authorities also are investigating security incidents at the German and Belgian consulates in Istanbul , the agency said without elaborating . The Belgian Consulate said that police were investigating a substance found in an envelope that had been sent there . The incident at the German Consulate involves a suspicious object , according to the German Foreign Office in Berlin . The office did n't elaborate about the object , but it said that Turkish authorities had been notified and that no one at the consulate came into contact with the object .
Suspicious items at Istanbul 's Canadian , German , Belgian consulates investigated . Report : No one at Canadian Consulate is exhibiting alarming reactions to substance . Comment: Belgian Consulate : A suspicious substance found in an envelope is being investigated .