The State Department is condemning the death of an Iranian activist during her father's funeral, saying the death was the result of "reprehensible actions" by Iranian security forces.

The activist, 54-year-old Haleh Sahabi, died Wednesday while attending her father's funeral. Iran's government-run media reported that she suffered a heart attack, but dissidents say she fell to the ground and died during a scuffle with security forces.

Haleh had been imprisoned following Iran's presidential elections in 2009 for supporting allegations that the re-election of President Mahmoud Ahmadinejad (ah-muh-DEE'-neh-zhahd) had been rigged. She was temporarily released to attend the funeral of her father, himself a critic of the Iranian government.

State Department spokesman Mark Toner issued a statement Thursday declaring Haleh Sahabi's death "a killing" and calling for an independent investigation.