(CNN) The two US athletes who demonstrated during separate National Anthems at a regional sports competition earlier this month have been put on probation for 12 months.

US Olympic & Paralympic Committee Chief Executive Officer Sarah Hirshland wrote to hammer thrower Gwen Berry and fencer Race Imboden, saying "while I respect your perspective -- and that of every athlete for whom I'm lucky enough to serve -- I disagree with the moment and manner in which you chose to express your views."

All participants signed agreements not to make any political, religious, or racial remark at the Pan American Games in Lima, Peru.

Hirshland's letter warned the two athletes another code violation could result in "more serious sanctions" than for an athlete in good standing.

Both athletes can still participate in sanctioned events. Berry will take part in the world track and field championships next month in Doha, Qatar.

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