If the "revolution" to oust Egyptian President Hosny Mubarak succeeds, Egypt will hold a referendum to decide the fate of its 1979 peace treaty with Israel, Israel's Channel 10 television quoted a Muslim Brotherhood official as warning Thursday.
"Israel has nothing to fear but its own crimes," Muslim Brotherhood spokesman Assam el-Erian told the channel.
But he also gave reassurances that the Brotherhood was a "non- violent" and not an extremist organization, dpa reported.
Israel is following the unrest in Egypt closely and with concern, fearing it could jeopardize its 31-year-old peace with the regional super power to its southern border.
Israeli officials have warned of a scenario in which Muslim extremists who might decide to discontinue the peace with Israel could assume power in Egypt.