"It was a petrol bomb," spokesman Zaw Htay confirmed to AFP, without giving further details on a possible motive for a small but rare attack targeting the Myanmar democracy heroine.
The petrol bomb caused minor damage. But the attack on the villa where Suu Kyi was held for long years of house arrest by the former junta is hugely symbolic.
Suu Kyi has increasingly attracted the ire of the international community over her perceived failure to speak up on behalf of Myanmar's Rohingya Muslim community.
Nearly 700,000 Rohingya have fled a brutal military crackdown in northern Rakhine state into refugee camps in Bangladesh since August, bringing with them testimony of murder, rape and arson.
Many inside Myanmar regard the Rohingya as illegal "Bengali" immigrants.
Suu Kyi was in Naypyidaw at the time of Thursday's incident and is due to address parliament to mark the second anniversary of her NLD government coming to power.
(This story has not been edited by NDTV staff and is auto-generated from a syndicated feed.)