A suspect package delivered to a hotel in Londonderry contained a "viable" explosive device, police have said.
Army bomb experts were sent to the hotel at Ebrington Square in the Waterside after the package was discovered at about 15:20 GMT on Tuesday.
They carried out a controlled explosion on the device, which was later taken away for a forensic examination.
Police Service of Northern Ireland Det Supt Kearney condemned it as a "reckless and targeted attack".
The detective said that a number of people were evacuated from The Ebrington hotel, along with staff from neighbouring premises.
The chair of a local policing watchdog said he believed it may be linked to the Ministry of Defence (MoD) having a stall at a careers fare at the same hotel last month.
A Halloween funfair had been taking place a short distance away from the hotel.
It remained open during the security alert.
Toni Collins said the targeting of The Ebrington was a "disgrace" especially in the run up to Halloween when thousands would be in the city.
"No one wants it and no one supports it," she said.
Teresa Boyle from Enniskillen is visiting the city. She said the community had moved on and no one wanted to return to the conflict of the past.
"That's what people want, peace."
The Mayor of Derry City and Strabane District Council councillor Grace Uí Niallais said her "thoughts are with the staff and anyone impacted".
"This was a serious and reckless incident which has no doubt caused trauma to all involved. We will not go back to the past but instead look forward to the fantastic four days of Halloween celebrations ahead."
Ulster Unionist councillor Darren Guy, who chairs the local policing and community safety partnership believes the incident was timed to cause maximum disruption.
He also said it may have been linked to the MoD being represented at a careers event at the hotel in September.
"Recently, there was a careers event held in that hotel where I believe an RAF [Royal Air Force] stall was there for the careers event at that time.
"I think this was specifically done this week to cause as much disruption as possible during the 40th Halloween celebrations with thousands of international visitors visiting the city and the amount of families, especially young families going out to enjoy the many things on offer.
"It is totally reckless and these people don't think about anyone else but themselves."
Sinn Féin councillor Christopher Jackson said it was too early to "speculate" about any link between the alert and the jobs fair.
"We need clarification from those responsible," Jackson said.
He said this was "a disgusting attack on the city and the people of Derry".
"There is no justification whatsoever for carrying this out and putting people in danger, especially when the city is gearing up for the 40th anniversary of the Halloween festival.
"Derry is a warm and welcoming place and it's disgusting why someone or some organisation did this."
Foyle SDLP MP Colum Eastwood told BBC Radio Foyle's North West Today programme the incident must have been terrifying for those members of the public in the vicinity of the hotel .
"This was clearly a viable device which is really frightening for the staff and the visitors to the hotel and to the hundreds, probably thousands of kids who were at that funfair yesterday and have been over the past number of days," Eastwood said.
"I don't know what entered someone's head to think this was a good idea.
"It is appalling, reckless and achieves absolutely nothing."
Julie Middleton, Democratic Unionist Party (DUP) assembly member for Foyle, told BBC Radio Ulster's Good Morning Ulster programme on Wednesday that she was "deeply disturbed and disgusted".
"There is no excuse to leave a viable device anywhere at all, but in the middle of Ebrington Square, where you have people at their work, families out enjoying some half-term fun and tourists visiting and unfortunately this was designed to cause disruption and with any viable device, it was obviously designed to cause harm."
Middleton said many children would also be in the vicinity enjoying the fun fair.
"To think anyone would place something like this near our children, or anyone for that matter, is just deeply wrong."
