In June ECB (European Central Bank) announced a new QE program. As a result EURUSD started falling on rumors.
On 12 September rumors became a fact. As a result profit taking action is expected. It should drive EUR higher. At least in short-term. Only new rumors about fresh QE measures by ECB will drive EUR lower.
This is a fine example of key trading strategy named "Buy on rumors — sell on the fact".
In terms of fundamental analysis a policy of Central Bank is a key factor that affects the currency. Economic data, political news and so on are secondary factors.