Libya's coastguard on Sunday warned against "illegal" fishing in its waters, denying Italian claims it had wounded a fisherman as it fired shots during an operation against four boats from Sicily.
Citing "repeated, documented violations", the coastguard said that on Thursday morning it had "received reports that four Italian fishing vessels were heading from southern Italy" into Libyan waters.
The coastguard dispatched a patrol to intercept and inspect the boats to ensure they were not carrying out "suspicious activities" or smuggling, it said, AFP reported.
But instead of cooperating, the boats fled, it added, sparking a three-hour chase in which "warning shots were fired in the air".
It said one of the boats was finally caught and inspected, and that a crew member had been injured when he hit the window of the boat.
"This is not the first time Italian fishing vessels have carried out such actions and violations," the coastguard said, warning that fishing in Libyan waters without authorization was illegal.
"Libya's preservation of the sovereignty of its waters is a legitimate right," it added.
For his part, Italian Foreign Minister Luigi Di Maio condemned the coastguard's actions but also warned captains against crossing into "dangerous" Libyan waters.
"We have been advising against going there not just for months but for 10 years," he said.
In September, 18 Sicily-based fishing crew members of various nationalities were captured off Benghazi by the forces of strongman Khalifa Haftar for fishing in Libyan waters. They were freed in December.