well it's (being used in the headlines as) the present progressive form of the verb pile: clowns had piled in; clowns piled in; clowns were piling in; clowns pi

well it's (being used in the headlines as) the present progressive form of the verb pile: clowns had piled in; clowns piled in; clowns were piling in; clowns pile in; clowns are piling in; clowns will pile in; clowns will be piling in; clowns will have piled in; pile in, clowns...