As thousands of Irish citizens took to the streets in celebration of St. Patrick's Day, several leaders have raised concerns about the need for people to practice restraint when drinking during the celebration.

Local authorities announced that they will be keeping a closer eye on people's drinking consumption for this year's celebration, in an effort to avoid incidents such as street fighting or drunk driving - events that have reportedly occurred in the past, right after the celebrations.

"There's no reason (why) people can't enjoy themselves and be part of the celebrations without going over the top," Irish Prime Minister Bertie Ahern said.

In observance of its pledge to be stricter with drinking regulations, Ireland's national police will be taking breathalyzers at certain checkpoints within the country - a first in Irish history.

Meanwhile, other officials will be stationed in Dublin to keep an eye on any alcohol-induced violent outbreaks, each of the 800 officers being given the authority to confiscate the drinks of those consuming alcohol in the streets or sidewalks.

The AFP reported that celebrations were held in other countries around the world.

American cities also showed public acknowledgement of the holiday, most recognized by citizens with Irish descent.

A Chicago river was tinted green Saturday, as a 200-float parade complete with bagpipe players and Irish dancers was launched.

Chicago, Savannah, Georgia, and New York also joined in the festivities.

Beijing also reportedly held its first St. Patrick's Day celebration.

Some even celebrated the holiday in 21st century technology style, through the 3D online virtual world Second Life.