PROVIDENCE — The Rhode Island Blood Center’s blood supply was low before Saturday’s mass shooting at Brown University, and it is immediately stepping up blood drives to meet the need, an official said Sunday.

“We were definitely dealing with some issues with inventory going into the incident,” Executive Director of Blood Operations Nicole Pineault said.

The supply was especially low for Type 0 positive and negative, which are often needed for mass casualty incidents, she said. Type 0 negative is considered the “universal” red blood donor, because it can be safely given to patients of any blood type.

Pineault attributed the low supply to weather, illness, and the lingering effects of the pandemic. With more people working from home, blood drives at office buildings are smaller, and young people — including college students — are not donating blood at the same rate as they did in the past, she said.

“There are a lot challenges,” she said.

But people can help by donating blood this week, Pineault said, suggesting they go to ribc.org or contact the Rhode Island Blood Center at (401) 453-8383 or (800) 283-8385.

The donor room at 405 Promenade St. in Providence is open seven days a week, Pineault said. Blood drives were already scheduled for this week at South Street Landing in Providence and at Brown Physicians, and the blood center is looking to add more blood drives in the Providence area this week, she said.

“It breaks my heart,” Pineault said of the shooting. “It’s a terrible tragedy. We run blood dives regularly on the Brown campus. Our heart goes out to all of the victims and the staff. We want to work with them to get the victims what they need.”

She said she cannot recall a similar mass shooting in Rhode Island.

“In moments of tragedy, it’s a reminder to the community how important the blood supply really is,” Pineault said. “It’s an easy way to give back, to help your neighbors, and be ready in unfortunate situations like this.”

The Rhode Island Blood Center has donor centers in Providence, Warwick, Middletown, Narragansett, and Woonsocket, and it has mobile blood drives, she noted.

On Sunday, the center’s website said “Donors urgently needed. Hours extended at some donor centers, 12/14.”

Edward Fitzpatrick can be reached at edward.fitzpatrick@globe.com. Follow him @FitzProv.