Police in Northern Ireland are on high alert after dissident republicans attempted to murder an officer with a car bomb and a second explosive device was discovered close to a police station.
The bomb placed under the car of an off-duty constable in east Belfast could have killed his wife and two young children, the Police Service of Northern Ireland assistant chief constable George Hamilton said.
"If that officer had not checked under his car we would have been looking at a murder or multiple murders," said Mr Hamilton.
In a separate incident, a pipe bomb was found close to the gates of a station in the town of Tandragee in Mid-Ulster, near the homes of elderly residents.
The booby trap device in Belfast was defused in a controlled explosion by the army. It was recovered from under the officer's car partially intact and police hope forensic tests on the remains could identify those who made and planted it.
Mr Hamilton said he was linking the attack to "anti-peace" dissident republicans, who have already murdered two police officers.
"We are hopeful that it will provide useful evidence," he said.
"The fact that it was discovered and it didn't ignite means that we obviously have a starting point forensically."
Police have been warning for months that republican militants remain determined to kill members of the security forces. On 1 November, prison officer David Black was shot dead as he drove along the M1 motorway on his work to work at the high-security Maghaberry prison in Co Antrim, which houses dissident inmates.
A group styling itself the "new IRA" claimed that attack. The faction was formed in the summer when several splinter groups joined forces.