Research In Motion Ltd said on Monday it plans to cut about 2,000 jobs, or 11 percent of its workforce, and would explain the financial impact of the cuts when it reports second quarter results on September 15.

The BlackBerry maker also announced a string of changes to executive responsibilities and, in the latest departure, said Chief Operating Officer Don Morrison would retire.

RIM stock, already near multi-year lows, was down just over 2 percent before the market opened.

RIM has been wilting under competition from Apple Inc and Google Inc. It said the job cuts are a prudent and necessary step for its long-term success.

The cuts bring RIM's headcount to about 17,000 people. It said one-time charges from the job cuts were not included in its outlook for the second quarter or for the full year.

(Reporting by S. John Tilak in Toronto, Aftab Ahmed in Bangalore; editing by Janet Guttsman)

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