A man attacked with a construction sign while riding his bicycle in the South Loop

A man was seriously injured when someone beat him with a construction sign and his own bicycle while he was riding in the South Loop Monday morning.

The 62-year-old man was attacked at around 1 a.m. Monday in the 2200 South State Street block, police said.

The man was taken to Northwestern Memorial Hospital in critical condition, police said.

No arrests were made.