Gun-wielding attackers aboard small vessels opened fire on a group of fishing boats in a restive area of the southern Philippines, killing 15 people in an apparent turf dispute between fishermen, the military authorities said Tuesday.

The man in charge of search-and-rescue on the stricken cruise liner Costa Concordia is due to talk about the operation Monday, as a decision looms about when to call off the search for victims and start offloading thousands of tons of fuel from the ves…