PHILADELPHIA — Officials say a two-alarm fire that is considered "suspicious" destroyed about 40 percent of the memorabilia at the home of famed Philadelphia International Records but spared the recording studio that gave birth to the "Sound of Philadelphia."

The fire broke out downtown at about 7:30 a.m. Sunday and injured one man, who authorities say was questioned and released.

Executive vice president Chuck Gamble says the blaze melted gold and platinum records, but the company's 10,000 master recordings are stored at an underground vault.

Philadelphia International Records produced many R&B classics of the 1960s and 1970s. Michael Jackson, Patti LaBelle and Teddy Pendergrass are among the musical luminaries to have recorded there with producing team Kenny Gamble and Leon Huff.