PAGE (AP) - A BNSF spokesman says the main track where more than 30 freight cars derailed over the weekend northwest of Fargo should be open today, but cleanup of the debris could take about a month.

"We still have not determined an official cause," BNSF spokesman Gus Melonas said Monday.

Officials said 37 cars and two locomotives went off the tracks near Page. No one was hurt. The train was headed from Minneapolis to Minot when it derailed Sunday afternoon.

Melonas said one tanker car leaked and one empty one burned.

"One of the tanks is leaking methanol, so they've got to make sure they've got that taken care of," Cass County Sheriff Paul Laney said Monday morning. "They're being very, very cautious … we don't want any other fires or explosions."

Earl Belling, who lives nearby, said he is used to seeing the trains, but he knew by the noise that something was not right. He said cars started flying off the track, almost like a scene from a movie, and he heard a blast.

"I heard two for sure, maybe three pretty good explosions," Belling said. "They (the flames) came clear across and buckled, but didn't break my patio windows."

He worried it might "rattle my house with me and my dogs in it."

Belling spent the night at a friend's home but was allowed back briefly Monday to get medicine for himself and one of his dogs.

Melonas said two area residents are being asked to stay away from the scene until it is considered safe.

He said crews were replacing damaged track Monday, and a secondary line would be opened to allow traffic to move through by midnight.