Alliance Leader Naomi Long has expressed anger at those who "dared to bring violence back onto our streets", after a car bomb exploded in Londonderry.
The explosion occurred outside the courthouse in Bishop Street, after police had received a warning.
"I, like many in the community tonight, am completely appalled and disgusted at this murderous attack - an attack on our peace, our prosperity and everything we have worked towards over the past 20 years, and an attack on the people of Derry~Londonderry.
"It is absolutely sickening that there are still people willing to bring violence to our streets and risk people's lives and livelihoods. Those behind this have no excuse and no support for their actions. Neither have they anything to offer beyond their desire to cause death and destruction.
"The people of Derry~Londonderry and of Northern Ireland are united in condemning this vile attack: those determined to drag us back to the dark days of the past can and must never be successful.
"I would urge anyone with information to contact the PSNI as soon as possible so that those responsible can be apprehended and dealt with before being allowed to strike fear into our community again."