FREMONT, Calif. (KRON) — Firefighters contained a slow-spreading grass fire on Stanford Ave in Fremont on Monday morning.

Cal Fire Santa Clara Unit first tweeted about what they’re calling the Mission Fire at 5 a.m.

The Fremont Fire Department said they don’t have an official cause yet, but believe it’s suspicious because there are no wires or anything nearby to cause the fire without interference.

The fire was just off of the main trail at the Mission Peak Regional Preserve, Fremont Fire said. As of 7:30 a.m., firefighters are on scene to fully extinguish it.

Steep terrain in the area of the fire is made it difficult to access. In good news, the winds in the area are less than 5 mph, making it a slower spreading fire.

This story will be updated.