A man remains in garda custody this morning following a dramatic armed robbery in Dublin.

At about 7.45 yesterday a man armed with a knife entered a newsagent's in Crumlin on the Long Mile road and demanded cash.

The man is understood to have fled the scene after threatening staff and got onto a Dublin Bus which was heading towards the city.

A witness alerted Gardaí and a number of units responded.

The bus was stopped at James Street and a man arrested a short time later.

A knife has been recovered and the man is being detained at Crumlin Garda Station.