An Associated Press journalist walked through the compound today after the Dawn of Libya, an umbrella group for Islamist militias, invited onlookers inside.
Some windows at the compound had been broken, but it appeared most of the equipment there remained untouched. The journalist saw treadmills, food, televisions and computers still inside.
A commander for the Dawn of Libya group, Moussa Abu-Zaqia, told the AP that his forces had entered and been in control of the compound since last week, a day after it has seized control of the capital and its strategic airport after weeks of fighting with a rival militia.
A video posted online showed men playing in a pool at the compound. In a message on Twitter, US Ambassador to Libya Deborah Jones said the video appeared to have been shot in at the embassy's residential annex.
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She also said it appeared the compound was being "safeguarded" and was not "ransacked."
The fighting prompted diplomats and thousands of Tripoli residents to flee. Dozens were killed in the fighting.
On July 26, US diplomats evacuated to neighbouring Tunisia under a US military escort. The State Department said embassy operations would be suspended until the security situation improved.