The school was briefly evacuated, with 143 students and staff leaving the building.
"It is imperative that immediate steps be taken to respond to the situation and identify and prosecute the perpetrators, so that we can stop future acts of intimidation", Hermann said.
The threats prompted evacuations in Jewish community centers and day schools in Alabama, Delaware, Florida, Indiana, Maryland, Michigan, New Jersey, North Carolina, New York, Pennsylvania, Rhode Island, and Virginia.
The threats in Harrisburg and York came on the heels of bomb threats made to almost a dozen other Jewish buildings across the country, including schools.
The most recent incidents prior to Monday morning were received a week ago, when media reports said 10 centers were evacuated following calls. "Now there's been a bomb threat at@KatzJCC & another cemetery desecrated, I urge everyone to stand up & speak out against anti-Semitism", wrote New Jersey Sen.
At Monday's press briefing, White House press secretary Sean Spicer said Trump "continues to be deeply disappointed and concerned" about "the reports of further vandalism at Jewish cemeteries".
The York JCC said it is working "closely with Governor Wolf, our local Congressional representatives, the Justice Department, and the Federal Bureau of Investigation to intensify the efforts to address these threats".
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Today's attacks bring the total since Trump became President to at least 89 attacks against schools and community centers.
Malkus noted that dozens of Jewish institutions have received similar attacks.
Handel said hateful and anti-Semitic actions are unacceptable."Pennsylvanians should be appalled at these cowardly acts of hate", he said in a written statement.
Warhit continued, "We would also like to thank our fellow Westchester residents from all ethnic and religious background who have stepped up to show their support in fighting anti-Semitism, bias crime, terror and hatred".
The Katz Jewish Community Center in Cherry Hill, N.J., which is also a preschool, tweeted at about 11 a.m. that it had safely evacuated and that police had arrived on scene. No explosive has been uncovered amid the months of threats, many of which have been called in.
It's not clear why up to 20 Jewish community centers across the South and Northeast were targeted, said Richard Sandler, chair of the JFNA board of trustees.