BY-MO 2019 Problem 92

The rhombus $ABCD$ is given. Let $E$ be one of the points of intersection of the circles $\Gamma_B$ and $\Gamma_C$ , where $\Gamma_B$ is the circle centered at $B$ and passing through $C$ , and $\Gamma_C$ is the circle centered at $C$ and passing through $B$ . The line $ED$ intersects $\Gamma_B$ at point $F$ . Find the value of angle $\angle AFB$ .

(S. Mazanik)