UP chief electoral officer Umesh Sinha said that the commission had asked the Faizabad district administration to submit a report over Lord Ram's poster on stage during the Modi's rally in the district.
Earlier, in the day, with the portrait of Lord Ram providing the backdrop, BJP PM candidate Narendra Modi asked people "living" in the birthplace of the Hindu deity to teach Congress and those who support it a lesson for not fulfilling electoral promises.
Modi skirted any reference to his party's pet theme of building Ram temple at the disputed site in Ayodhya, which is part of the district and epicentre of Ram Mandir movement, but made several references to Lord Ram to exhort people to defeat Congress, SP and BSP and support BJP.
"This is the land of Lord Ram where people believed in 'Pran jaye par vachan na jaye' (one may lose life but cannot break promise). Can you pardon those who broke their promises?," the BJP prime ministerial candidate said a rally, referring to the ruling party's unfulfilled promise of providing 10 crore jobs to people.
He also took on SP, which is in power in UP, and Mayawati-led BSP, saying they are enemies in Lucknow but friends in Delhi.
"They save the government of 'maa-beta (Sonia-Rahul)'. The Congress saves them from CBI. It protects netaji (Mulayam Singh Yadav) from CBI. They believe in you scratch my back, I scratch yours.
"I, from this land of Lord Ram, promise you that I will fight corruption my whole life. Where do I get the strength to speak this? I have lived this my whole life," he said.
The SP and BSP governments spend their time in settling scores with each other. "Law and order is so bad that people prefer buying guns to providing medical care to their parents and good education to their children," he said.
With PTI inputs