The incident took place after a roadshow organised by local Congress candidate Harminder Singh Jassi ended.
Jassi is a relative of Sirsa-based Dera Sacha Sauda head Gurmeet Ram Rahim Singh.
Investigators found a pressure cooker at the scene, which may have been used to trigger the explosions.
Police officials said, based on preliminary investigations, that the twin IED blasts took place in an abandoned Maruti 800 vehicle and a scooter near Jassi's rally venue.
"The vehicle has been badly damaged".
He said "the three people who died were standing near the auto when the explosion took place".
The incident in Maur Mandi town, about 200 km from here, came days before polling in the assembly elections, slated for February 4 (Saturday).
Mr. Badal attacked Delhi Chief Minister Arvind Kejriwal and his Aam Aadmi Party, alleging that the incident was a direct result of the party's nexus with radical elements. "This blasts prove that our apprehensions were correct and that radical elements have infiltrated into Punjab in league with the AAP", he said.
He asked the Election Commission to keep a strict watch on radical elements who, he alleged, had become active in the state after a long time.
Amarinder said Kejriwal was fanning terror forces through his actions, led by the risky mix of the AAP extreme left and extreme right ideologies. "With the entry of AAP-sponsored outsiders, tensions have escalated".
State Congress president Capt. Amarinder Singh squarely blamed Mr. Kejriwal for promoting extremist forces such as the Khalistan Commando Force.
Punjab Chief Electoral Officer VK Singh said that the guidelines have been issued in accordance with the provisions enacted in Section 126 of Representation of Peoples' Act.
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