At least three people are reported to have died following a shooting in the US state of Maryland.
Police said a lone suspect is in custody and in a critical condition.
They added that officers did not fire any shots when they arrived at the scene in Aberdeen, about 30 miles northeast of Baltimore.
At this time we can confirm multiple wounded and multiple fatalities
— Harford Sheriff (@Harford_Sheriff) September 20, 2018
Police have not confirmed that the suspect, who is under armed guard in hospital, is a woman.
Harford County Sheriff Jeffrey R Gahler said there was no longer any threat to the public after the incident in the Perryman area.
He said there were multiple fatalities and multiple injuries but that authorities were taking care in the preliminary investigation to avoid giving incorrect information.
Based on what we know, thus was a lone suspect. The suspect is in custody and in critical condition at the hospital
— Harford Sheriff (@Harford_Sheriff) September 20, 2018
A law enforcement official has said that three people were killed in the shooting, based on preliminary information.
The shooting occurred at a Rite Aid support facility, a pharmacy-like company where about 1,000 people work.
Mr Gahler said the call about shots fired came in from the Rite Aid distribution centre at 9.06am local time (1.00pm GMT), and deputies and other officers were on the scene in just over five minutes.
Susan Henderson, a spokeswoman for the company, said: "What I understand is the location is secure.
"The distribution centre is where products are received and processed for delivery.
"This is part of a large facility that is a distribution centre. The shooting happened adjacent to the primary building."
Before the incident ended, the FBI's Baltimore field office tweeted that it was responding and assisting the sheriff's office with the situation.
The Baltimore field division of the federal Bureau of Alcohol, Tobacco, Firearms and Explosives tweeted that its special agents were responding too.
Maryland Governor Larry Hogan said: "We are closely monitoring the horrific shooting in Aberdeen. Our prayers are with all those impacted, including our first responders.
"The State stands ready to offer any support."
The First Lady and I are grieving for the loss of life in today's shooting in Harford County, and praying that those who were injured fully recover. I remain in close contact with Harford County officials and state and local law enforcement as they continue to investigate.
— Governor Larry Hogan (@GovLarryHogan) September 20, 2018
