ANTIOCH (BCN) — A San Francisco man riding a motorcycle crashed this afternoon into a tree in Antioch and suffered critical injuries, police said.

Dispatchers received several calls at 2:08 p.m. reporting the collision at Hillcrest and Terrace View avenues.

Officers determined that the man was speeding north on Hillcrest Avenue when he lost control of the bike and crashed into a tree in the median of the avenue, according to police.

The 49-year-old man was taken to a hospital in critical but stable condition. Neither alcohol nor drugs appear to have played a part in the crash, police said.