Twenty-nine people were injured on Sunday, Sept. 18, in the Chelsea neighborhood of Manhattan, New York City, in what authorities are calling a terrorist attack. Along with the bomb that went off on Sunday in Chelsea, another explosion was reported the day before in Seaside Park, New Jersey.

The FBI has arrested 28-year-old Ahmad Rahami for the Chelsea bombing, who had written about his hopes for martyrdom and wrote that God willing, “the sounds of the bombs will be heard in the streets,” according to an FBI complaint.

New York City Mayor Bill de Blasio announced on Sunday, “We know it was a very serious incident, but we have a lot more work to do to be able to say what kind of motivation was behind this.”

Just one day before, a bomb exploded in a garbage can near a Marine Corps charity run in Seaside Park. This however caused no injuries as it went off far away from the participants of the run. New Jersey investigators found three pipe-bomb-type devices wired together. Timers were set on the pipes, yet only one of them detonated.

While there were some similarities between the Chelsea device and the Seaside Park device, it is too soon to tell if the bombings are connected.

With the bombs now being investigated by the Joint Terrorism Task Force, New York Governor Andrew Cuomo stated, “A bomb going off is generically a terrorist activity. That’s how we’ll consider it. And that’s how we will prosecute it.”

Together with these two bomb threats, an attack in Minnesota is being investigated as an act of terrorism as well. The FBI was called after a knife attack at a shopping mall in St. Cloud injured nine people. An off duty police officer shot the assailant, who was a “soldier of the Islamic state” according to an ISIS-linked news agency, before he could get his hands on a tenth victim.

Although no police departments received any national threats preceding this stabbing, the FBI is considering the attack “a potential act of terrorism.” The matter is being treated with much caution for the attacker is known to be of Somali descent, and St. Cloud is home to many anti-Muslim organizations.

All reported accounts are being looked at very seriously, and the FBI is investigating all three counts as possible acts of terrorism. It cannot yet be determined whether or not there is a distinct connection, but the proper security measures are being taken to ensure the safety of United States citizens.