Chandigarh Police officials said that they were investigating the matter even though they ruled out a conspiracy of an attack on the union minister.
'We have sent the bottles for examination to know what they contained,' a police official said.
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Tewari, who left for his Lok Sabha constituency Ludhiana Saturday, alleged that someone could have kept the bottles near his house under a conspiracy to attack him.
The minister enjoys Z-category security cover and visits his Sector 19 house here often. Police personnel are posted at his residence.