NEW YORK — Homeland security and terrorist threats are back on the front burner of the presidential campaign after a device blew up Saturday night in New York City and incidents in New Jersey and Minnesota earlier in the day.

Democratic presidential nominee Hillary Clinton on Sunday condemned what she characterized as “apparent terrorist attacks.”

“Law enforcement officials are working to identify who was behind the attacks in New York and New Jersey, and we should give them the support they need to finish the job and bring those responsible to justice,” Clinton said in a statement, adding: “We will not rest until that happens.”

A pipe bomb exploded Saturday in Seaside Park, N.J., before the start of a charity 5K race to benefit Marines and sailors.

The former secretary of state noted the Islamic State, also known as ISIS, had asserted responsibility for the stabbings of nine people Saturday inside a mall in St. Cloud, Minn.

“This should steel our resolve to protect our country and defeat ISIS and other terrorist groups,” Clinton said.

New Jersey Gov. Chris Christie, who backs Republican Donald Trump, said on CNN that, “if you look at a number of these incidents, you can call them whatever you want. They are terrorism though. There's no doubt about that.”

At a rally Saturday in Colorado Springs, Colo., Trump announced that “a bomb went off in New York” before it was confirmed to have been an explosive device.

“We better get very tough, folks,” Trump said. “It's a terrible thing that's going on in our world and in our country, and we are going to get tough and smart and vigilant.”

Bloomberg News contributed.