Here's a link describing some of the methods used. Scroll down to the heading, Combating Piracy. The pirates involved in taking these big ships aren't fools, just the opposite. Boarding a huge ship from a small boat is best accomplished by stealth or guile not with guns blazing. Shooting at an oil or lpg tanker is risking suicide by fire and/or explosion, not much profit in that.
The latest seizure demonstrates that these pirate syndicates are adjusting their tactics by expanding their area of operations farther out to sea. Probably because of the increased awareness of pirate activity by crews when closer to shore, and the relaxation of vigilance when farther out.
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