The acting duo, who ended their relationship last year, were apparently both at Mehboob Studios working on different projects but did not acknowledge each other's presence.
"Not a word was exchanged between the estranged couple," a source claimed.
"SalKat were shooting in the same premises for almost the entire day but didn't even bother to go say hello to each other. The air in Mehboob was rife with tension with people speculating what would happen when Khan and Kat stepped outside their vans and bumped into each other.
"It wasn't just the ex-lovers who kept their distance, even Salman's one time protégé Hrithik Roshan didn't drop in on Khan's set to greet him. The last time they were in Mehboob,Salman had gone to Roshan Jr's van and chatted with him."
However, Kaif denied the reports, saying: "It's untrue. We all had lunch together."