(Chages sourcing, adds background from paragraph 4 onwards) Nov 7 (Reuters) -

UPS on Friday said it has grounded its fleet of McDonnell Douglas MD-11s, the type of plane involved in Tuesday's crash in Louisville, Kentucky, which killed at least 13 people. "Out of an abundance of caution and in the interest of safety, we have made the decision to temporarily ground our MD-11 fleet," a UPS spokesperson said in an emailed statement to Reuters. MD-11s account for about 9% of the company's fleet, the spokesperson added. The grounding is effective immediately.

The news was first reported by NBC News. On Tuesday night, a UPS cargo plane bound for Honolulu

crashed just after takeoff at Louisville International Airport. On Friday, U.S. safety investigators said as a bell sounded in the cockpit,

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