The international movement calling for a boycott of Israel says its website was repeatedly attacked earlier this year.
The BDS movement released a report Thursday showing that its main website suffered six attacks in February and March.
The report, compiled by nonprofit online security service eQualit.ie, said the attacks had a level of "sophistication and commitment" it normally does not see.
Assigning responsibility for cyber attacks is notoriously difficult, and the report didn't speculate on who might be behind the rogue traffic. The BDS movement raised the possibility of Israeli involvement, but it offered no hard evidence.
BDS calls for boycotts, sanctions and divestment from Israel in what it calls a nonviolent struggle against occupation. Israel says BDS' goal is to destroy the country.