MODESTO (CBS13) — Firefighters say an early morning fire at a pallet yard went to four-alarms on Friday.

The scene is along the 1700 block of Reliance Street in Modesto.

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The fire was still smoldering through the morning hours.

" data-medium-file="https://sacramento.cbslocal.com/wp-content/uploads/sites/15909776/2020/07/4-alarm-pallet-fire-modesto.jpg?w=300" data-large-file="https://sacramento.cbslocal.com/wp-content/uploads/sites/15909776/2020/07/4-alarm-pallet-fire-modesto.jpg?w=420" loading="lazy" class=" wp-image-654709" src="https://sacramento.cbslocal.com/wp-content/uploads/sites/15909776/2020/07/4-alarm-pallet-fire-modesto.jpg?w=420" alt="" width="324" height="182" srcset="https://sacramento.cbslocal.com/wp-content/uploads/sites/15909776/2020/07/4-alarm-pallet-fire-modesto.jpg 1280w, https://sacramento.cbslocal.com/wp-content/uploads/sites/15909776/2020/07/4-alarm-pallet-fire-modesto.jpg?resize=150,84 150w, https://sacramento.cbslocal.com/wp-content/uploads/sites/15909776/2020/07/4-alarm-pallet-fire-modesto.jpg?resize=300,169 300w, https://sacramento.cbslocal.com/wp-content/uploads/sites/15909776/2020/07/4-alarm-pallet-fire-modesto.jpg?resize=768,432 768w, https://sacramento.cbslocal.com/wp-content/uploads/sites/15909776/2020/07/4-alarm-pallet-fire-modesto.jpg?resize=1024,576 1024w, https://sacramento.cbslocal.com/wp-content/uploads/sites/15909776/2020/07/4-alarm-pallet-fire-modesto.jpg?resize=640,360 640w, https://sacramento.cbslocal.com/wp-content/uploads/sites/15909776/2020/07/4-alarm-pallet-fire-modesto.jpg?resize=310,174 310w, https://sacramento.cbslocal.com/wp-content/uploads/sites/15909776/2020/07/4-alarm-pallet-fire-modesto.jpg?resize=1138,640 1138w, https://sacramento.cbslocal.com/wp-content/uploads/sites/15909776/2020/07/4-alarm-pallet-fire-modesto.jpg?resize=320,180 320w, https://sacramento.cbslocal.com/wp-content/uploads/sites/15909776/2020/07/4-alarm-pallet-fire-modesto.jpg?resize=620,349 620w" sizes="(max-width: 324px) 100vw, 324px"> The fire was still smoldering through the morning hours.

Modesto Fire says the incident, which started just before 3:30 a.m., prompted a four-alarm response. Firefighters from Modesto, Ceres, Turlock and the Stanislaus Consolidated Fire Protection District responded.

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Firefighters were able to contain the flames to the yard, officials say.

Exactly what started the fire is now under investigation.

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Crews remain at the scene through the early morning hours as the fire smolders.