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"Mike watching the first tugboat setting up to pull us," writes Chase Maclaskey on Instagram. The 4,229 passengers and crew aboard the Carnival Triumph have been stuck on the ship since fire disabled the vessel on Sunday, February 10. Click through to see passengers' photos from on board.

"One of two tugboats pulling us through the channel to Mobile, Alabama, along with a channel guide boat," writes Maclaskey. The ship is being towed slowly to Mobile, Alabama, and is expected to port late February 14.

Passengers set up makeshift beds on a deck of the ship.

Passengers fill the deck of the ship and look up toward the sky.

Passengers lie on beds in a hallway aboard the Carnival Triumph.

iReporter Robin Goebel says passengers dubbed an area "tent city" where many had chosen to set up temporary shelters on the deck of the disabled Carnival Triumph. Many slept on the decks of the ship because the rooms were too hot.

Passengers aboard the disabled Carnival Triumph cruise ship wave to a helicopter overhead as it approaches the vessel on February 14.

"This was one of the discovered only working outlets so people put their power strips together and we made a huge charging station," wrote passenger Kaitlyn Robertson.

Passengers lie on mattresses in a hallway aboard the Carnival Triumph.

According to passenger Megan Clemons-Foxall these "buckets of sewage" rest in stairwell aboard the ship.

Passengers help themselves to food aboard the ship.

Instagram user Jacob Combs shot this photo of his balcony on the ship with the caption, "Excited for working toilets!"

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Washington (CNN) -- The fire that crippled the Carnival cruise ship Triumph started with a leak in a fuel-oil return line connected to the ship's No. 6 generator, the U.S. Coast Guard said Monday.

Leaking oil hit a hot surface, starting the fire, said Teresa Hatfield, the lead investigator for the Coast Guard. Hatfield said there was no indication the leak was intentional.

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Hatfield said the investigation will last for several months. The Coast Guard said it has conducted 21 interviews with passengers and crew members since last Thursday, when investigators boarded the ship while it was still at sea.

Hatfield said the oil return line is one of the items that is routinely inspected, but she did not say when it was last inspected or describe its condition at that time. She praised the crew for doing a "very good job" containing the fire.

The Triumph was on the third day of a planned four-day cruise from Galveston, Texas, to Mexico when the fire broke out and brought the trip to a halt. It was carrying more than 4,200 people, including 3,100 passengers. The Triumph was eventually towed into port in Mobile, Alabama, Thursday night, and the last passengers disembarked Friday.

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CNN's Jim Barnett contributed to this report.