International teams deployed remote-controlled, underwater vehicles as part of the increasingly urgent search for the Titan submersible that disappeared in the North Atlantic.
Three more vessels arrived Wednesday to join the international effort to find the missing submersible. A Coast Guard official said “we don’t know the source” of the noises.
The authorities said they had arrested a 31-year-old man but did not give a motive for the attacks in central England. Two of the dead were university students.
Two adults and four children were injured in the assault, which shocked the country and could have been worse if not for the intervention of a 24-year-old man known only as Henri.
Joran van der Sloot, who had been in prison in Peru, was sent to the United States to face charges related to Ms. Holloway, who went missing during a 2005 trip to Aruba.