Definition: In this task, you need to generate an appropriate title for the given summary of some paragraph. The generated title must be short and should include the main topic of the given text. Your summary should be less than 20 words long.
Input: A Norwegian warship was repeatedly warned of its collision course with a Maltese oil tanker before then hitting it in a fjord, the BBC has been told.

Norway warship Helge Ingstad 'warned' before collision