Need some explosives detection dogs at these places.
My guess is that there is a campaign afoot by Muslims working to instill fear in the Jewish Community and to trigger some kind of response by authorities (which agency, what level of government, time from visit to agency action, etc.). Possibly even to trigger enough of a response so they can file a lawsuit with CAIR’s help.
There likely wouldn’t be any evidentiary reason to hold these Muslim women for ‘simply asking questions.’ They’ll not be armed, nor connected with bombs, weapons or any direct terroristic markers.
It is the same kind of tactic Muslim agitators use when groups of them get on an airplane and then all stand up and start jibber jabbering.