Security sources in Northern Ireland fear the next attack by Republican dissidents is likely to involve a bomb, Sky News has confirmed. It follows reports that the Real IRA has smuggled a large device into the province from the South. Sky's Home Affairs correspondent Mark White says the focus of investigations is now on a 300lb car bomb left at Castelwellen at the end of January. That bomb was diffused after a warning call was received. It caused a security alert outside the town for five days. Security sources suggest that whoever put the "sophisticated" device together was an experienced...