Pakistani police said on Tuesday they found 45 kg (100 lb) of explosives hidden in a car near the residence where former president Pervez Musharraf is under house arrest, television channels reported.
Video footage showed a bomb disposal squad examining a car near the farmhouse on the edge of the capital Islamabad where the former army chief was detained last week over allegations he had overstepped his powers while in office.
There was no immediate word from police on who they suspected might have planted the explosives.
Pakistan's Taliban movement have threatened to kill Musharraf, who returned from almost four years of self-imposed exile last month in the hope of relaunching his political career at general elections on May 11.
Instead, election officials disqualified him from running and judges ordered he be placed under house arrest to face a hearing next month over allegations he unlawfully ordered the detention of judges in 2007 when he was still in office.