A Barcelona judge on Tuesday ordered two Catalan police officers to testify before him in the case of a woman who lost an eye when, she claims, a rubber bullet hit her during a November 14 demonstration.
The judge has named the two members of the region's riot squad as targets in his investigation.
Ester Quintana, 42, said she was struck by a projectile fired by the Mossos d'Esquadra, but regional officials maintain that the object may have come from another source.
Police sources say that officers launched projectiles at least six times on the Paseo de Gràcia thoroughfare.
Judge Francisco González has been reviewing all CCTV footage from businesses in the area in an attempt to clarify what happened.