sentences:  Also, parts of the Croatia-Serbia border are known minefields, which represent a considerable threat.According to the Croatian Minister of Interior Ranko Ostojić, "police in the area have enough people and equipment to protect the Croatian border against illegal immigrants".Croatian President Kolinda Grabar-Kitarović and First Deputy Prime Minister Vesna Pusić have so far rejected the option of building a fence along the Croatian border with Serbia.