PORTLAND, Ore.  — The only railroad trestle trains can use to cross the Columbia River from Oregon to Washington was shut down Tuesday after fire erupted, likely caused by repair workers with torches.

Heavy smoke billowed from a fire on the bridge along Marine Drive and North Portland Avenue Tuesday morning in an area where Portland Fire & Rescue said was difficult to access. The bridge is not far from the Portland Expo Center.

Crews in fireboats had the blaze under control and out before noon, about an hour after it was spotted.

All train traffic — including Amtrak and Union Pacific trains — are stopped at this time.

Officials are inspecting the bridge to determine if it can be re-opened.

No injuries have been reported.