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See photos from the eight-alarm blaze in Waltham

Scot Eisen for the Boston Globe

Firefighters were at the scene of an eight-alarm blaze in Waltham early Sunday morning.

Scott Eisen for The Boston Globe

The blaze struck an apartment complex that was under construction in Waltham before dawn Sunday morning.

Scott Eisen for The Boston Globe

Firefighters from across the Boston area responded.

Scott Eisen for The Boston Globe

No injuries were reported, although five buildings collapsed.

Scott Eisen for The Boston Globe

The fire’s cause wasn’t immediately known.

Scott Eisen for The Boston Globe

The fire struck an apartment complex that was under construction.

Scott Eisen for The Boston Globe

Buildings collapsed during the blaze.