Published Tuesday, 11 March 2014
A police officer mans the cordon at the scene in the Waterside area of Derry. (© UTV)
The pipe bombs exploded within minutes of one another outside the front doors of the houses belonging to Romanian families at Lincoln Court and Lapwing Way in the Waterside area.
No-one was injured in the attacks which police say they are treating as hate crimes.
On Monday, a senior PSNI officer said that the two pipe bombs were both packed with nails.
"I appeal to members of the community not to have any misplaced sense of loyalty to those who carried out these attacks. Putting nails into pipe bombs is a sinister development and we are treating this as a hate crime," Chief Supt Jon Burrows said
"Nails are put there for one reason only and that is to inflict serious injury. Only two families were attacked and they are both Romanian.
"The very small minority of people who do this sort of thing do not speak on behalf of the vast majority of the people in this city who are pluralist and kind."
The two arrested men were questioned at Antrim Serious Crime Suite before being released unconditionally on Tuesday morning.
© UTV News