One thing that isn't particularly clear, is the timestamps on tweet library. Based on the top entry, I presume those are UTC. So if the action kicked off at 1 AM PST (UTC+5 according to wiki), then it would have been 4 PM EDT (UTC-4) in Washington. 3:50 PM doesn't jive with this (unless Pakistan is on DST).

Another article said that the burial at sea was completed by 2 AM EDT (so they presumably were done by 3 PM in Pakistan, about 14 hours after the first tweet).