The Riverdale synagogue that authorities say was targeted by four men in an alleged terror plot is returning to "business as usual," says the center's executive director.

Dave Winter says services took place Thursday morning despite the arrests of the four men from Newburgh, N.Y., who authorities say were also plotting to bomb another Bronx synagogue and shoot down military planes.

Yoni Garber, who's a member of the Riverdale Jewish Center, says news of the alleged plot is "a scary thing," but that keeping up a normal routine is a must.

"Right now, it's more important than anything to stick together," Garber says.