The BSP and its ally Samajwadi Party protested outside voting machine storage rooms demanding police action.
Ghazipur's BSP candidate Afzal Ansari and his supporters were seen having a heated exchange with a police officer.
The Election Commission called the allegations "frivolous" said the voting machines were maintained in "proper security and protocol".
Ghazipur and Chandauli voted on Sunday, in the final round of the seven-phase election.
Last Tuesday, workers of the Samajwadi Party and Bahujan Samaj Party, who fought the polls together, 'caught' a mini-truck full of EVMs being taken out of the compound of a storage room in eastern Uttar Pradesh's Domariyaganj seat. The alliance workers said this was an attempt by the BJP to tamper with the voting machines. After protests, the voting machines were taken back into the counting centre compound.
The local administration claimed these were extra EVMs sent to them before the sixth round of voting and that they were being taken to districts voting in the seventh phase.
In Domariyaganj, a district official reportedly called an election team on his phone through the loudspeaker and tried to get them to acknowledge that the transfer of EVMs was happening per their orders but the local election body official on the other side apparently said he wasn't aware.
A senior official in Uttar Pradesh's Domariyaganj reportedly tried to get an election body official to acknowledge that the transfer of EVMs was happening per their orders.
Similar allegations have come up from Jhansi, Mau, Mirzapur, parts of Haryana, Punjab and Bihar.
"All these EVMs that were being transported. There were no unknown persons involved. In Jhansi, a city magistrate was there. In all other instances a Sub Divisional Magistrate and tehsildar were in the know and were taking these EVMs . No unauthorised vehicle or person was involved," Uttar Pradesh's Chief Electoral Officer Lakku Venkateshwarlu said.
In Bihar, Lalu Yadav's Rashtriya Janata Dal alleged the suspicious movement of EVMs in Maharajganj and Saran parliamentary constituencies.
RJD leader Tejashwi Yadav tweeted last night:
The RJD's allegations have been refuted by the administration, which said the machines were for training.
The videos and the allegations have emerged just ahead of a meeting of 21 opposition parties, including the Congress, with the Election Commission this afternoon to flag their concerns about Electronic Voting Machines and the VVPAT (Voter Verified Paper Trail Machines).
According to an order by the Election Commission in December last year, all EVMs that were used for voting and reserve EVMs "shall be under cover of armed police at all times" after polling process is over. The order says "reserve EVMs should also be returned at the same time when the polled EVMs are returned at the receipt center".
Election Results for Lok Sabha Election 2019 will be out on May 23. Get the latest election news and live updates on ndtv.com/elections. Catch all the action on NDTV Live. Like us on Facebook or follow us on Twitter and Instagram for news updates from each of the 543 parliamentary seats for the election 2019