The families of the six victims of yesterday's tragic balcony collapse are arriving in Berkeley, California.

Seven others were injured at the apartment complex and are being treated at a number of hospitals.

Their conditions are said to vary, but some are believed to be in critical condition.

Books of condolence are open at UCD - where many of the victims studied - and at County Hall in Dun Laoghaire.

A separate book of condolence will open at the Mansion House in Dublin tomorrow from 10am.

Meanwhile, Irish flags on public buildings will fly at half mast.

We take a look back on the day and its aftermath with these poignant pictures.

Toni Mikulka places flowers at a makeshift memorial for victims of a balcony that collapsed in Berkeley | Image: Jeff Chiu / AP/Press Association Images

Berkeley Mayor Tom Bates (left) and Philip Grant, Consul General of Ireland of the Western United States, walk in front of a building where a balcony collapsed in Berkeley | Image: Jeff Chiu / AP/Press Association Images

Philip Grant, Consul General of Ireland of the Western United States (left) and Berkeley Mayor Tom Bates (second from left) stand with Berkeley fire fighters before placing wreaths at the Library Gardens apartment complex | Image: Jeff Chiu / AP/Press Association Images

A flag of Ireland is draped over wreaths at the Library Gardens apartment complex in Berkeley | Image: Jeff Chiu / AP/Press Association Images

Berkeley Mayor Tom Bates (left) hugs Philip Grant, Consul General of Ireland of the Western United States after placing wreaths at the Library Gardens apartment complex in Berkeley | Image: Jeff Chiu / AP/Press Association Images

Workers remove part of a fourth floor balcony that fall onto the balcony below at the Library Gardens apartment complex in Berkeley | Image: Jeff Chiu / AP/Press Association Images

 

Tricolour at half mast over Leinster House as Ireland mourns the loss in #Berkeley #ntfm

A video posted by Newstalk FM (@newstalkfm) on Jun 17, 2015 at 12:28am PDT