Large bright white triangular shapes streaking across the sky coming to an abrupt stop, holding position for 10 sec. then disappearingOn November 4, 2013 in the late evening (around 10pm) while sitting on the beach in Key Largo, FL, I saw about six to eight very large, very bright, very distinct opaque white triangular shapes resembling an irregular tightly formed flock of birds crossing the sky in a split second. They traveled in a perfectly straight line in a westward direction and abruptly came to a stop. The shapes held that position for about 10 seconds and then just disappeared. I attempted to bring them to my husband's attention, but he missed the event.About 5 minutes later, he pointed out a singular triangular shape in the northern sky identical to the ones I had just seen. It rapidly crossed the sky from west to east then zigzagged in a downward direction and disappeared. My husband does not believe in UFOs but said he could not think of any other explanation than the possibility of an experimental military aircraft.We talked about it for a little while and then just sat and enjoyed the night. Unbelievably, about twenty minutes later, a star-like flash of bright white light streaked from behind me heading in an upward northerly direction and quickly disappeared into the night. It happened before I could get the words out to tell my husband.((NUFORC Note: Witness elects to remain totally anonymous; provides no contact information. PD))