(Not a teacher)
News story headlines are purposefully short and ambiguous, often because of space constraints. Their purpose is to catch your attention and make you want to read, and they are one of the few times in writing you will see 'bad' English as standard.
I found this link, although I don't always find About.com useful myself, it does describe headlines in a fair bit of detail.
Newspaper Headlines - Explanation of Newspaper Headlines for English Learners
Student or Learner