BATTLE CREEK, Mich. - Officials have devoted more resources to the cleanup of an oil pipeline burst into the Kalamazoo River.

The leak dumped more than 800,000 gallons of oil.

Enbridge, the company operating the pipeline, said it is doubling its work force on the containment and cleanup effort.
     
"We've made significant progress," Enbridge CEO Patrick D. Daniel said. "But we still have a long way to go in terms of cleanup."
     
The company had about 200 employees and contractors working on the spill Tuesday. The Environmental Protection Agency is bringing in additional contractors.  

There was no update on a possible cause, cost or length of cleanup.
      
The 30-inch pipeline was built in 1969 and carries about 8 million gallons of oil daily from Griffith, Indiana, to Sarnia, Ontario.
   
State officials were told during a company briefing Tuesday that an estimated 877,000 gallons of oil spilled, said Mary Dettloff, spokeswoman for the Michigan Department of Natural Resources and Environment.
 
As of late Tuesday, oil was reported at least 16 miles downstream of the spill. Company officials said the spill appeared to be contained and oil wouldn't likely drift much farther downstream.