The European Central Bank left Thursday its key interest rates on hold. 
The ECB had already announced a package of stimulus measures back March. The policies aimed at improving inflation and economic growth in the Eurozone. 
The March package of measures included lowering the ECB's benchmark refinancing rate to zero and driving the deposit rate deeper into negative territory. The deposit rate, which represents a charge on banks for parking funds at the ECB, was held at minus -0.4%.