Tens of thousands have gathered in the driving rain at St. Peter’s Square in the Vatican as the process to elect a new Pope continues.

A successor to retired Pope Benedict the XVI did not emerge after the fourth round of voting this afternoon.

The next puff of smoke to emerge from the chimney of the Sistine Chapel is expected before 6.30pm (Irish time).

At this point of the last conclave, Pope Benedict was elected.

Many believe his successor be declared this evening or tomorrow.

Most observers say that could harm the chances of frontrunners Angelo Scola of Milan and Odilo Scherer of Brazil

If there is no decision tonight, then the Cardinals will retire for prayers and dinner at St Martha's residence where they have lived throughout the Conclave.

The successful candidate needs 77 of the 115 eligible votes to be elected Pope.