Gardai investigating the murder of Detective Adrian Donohoe are trying to track down a bright-green child's car seat and a mallet-type hammer with a black and red handle.

The 41-year-old Detective was killed during a botched robbery - involving a 5-person gang - at the Lordship Credit Union near Dundalk in Co. Louth.

The investigation into the killing of the father of two is progressing well.

Over 2,300 lines of inquiry are being pursued and statements from more than 800 people have been taken.

Information sought on blue Volkswagen

As a fresh appeal is made for information officers have released details of a distinctive child car seat missing from the car used in the murder which was burnt out across the border and a panel-beating hammer found at the scene.

Information is being sought about the 08-D blue Volkswagen Passatt, the luminous green Cosatto child car seat and a black and red mallet hammer.