Prosecutors in Sicily are investigating video footage that allegedly shows a Libyan Coast Guard vessel firing warning shots at a migrant boat in the Mediterranean Sea. The probe, however, will face an uphill struggle.

a German organization that pulls refugees from the Mediterranean and delivers them to Europe, shows a Libyan Coast Guard ship shadowing a smaller craft carrying migrants, allegedly near Malta.

The Libyan vessel sticks dangerously close to the migrant boat, crossing its path on several occasions. At one point in the video, shots are seemingly fired. While the shots are audible in a version posted by Sea Watch to YouTube, they are difficult to discern in a different version on the group’s website.