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From my understanding, women are meant to cover their hair at all church services for a few reasons such as: not to serve as a distraction to men and to be modestly dressed in the house of God. In this circumstance, I believe there is no reason/instruction but merely a lapse. In my personal opinion, they're women who are in mourning - I'm sure in their a situation their first priority when they got to church wasn't to find an asharb.. I think it's such a small detail to worry about in the course of such a great tragedy. But then again that's just my opinion.
Women do not tend to cover themselves in Church in such occassions.