Sea Shepherd ship attacked in Mexico's Gulf of California.

The Sea Shepherd environmental group said Friday that one if its ships was attacked with rocks and partly set afire by a flotilla of about 20 fishing boats in Mexico's Gulf of California.

It was the second attack in a month in the upper Gulf, where Sea Shepherd is patrolling against illegal nets to help save the critically endangered vaquita marina porpoise. The patrols have drawn the ire of local fishermen.