Warwickshire County Cricket Club said officials are investigating allegations of racist behaviour among members of the crowd at Edgbaston on the fourth day of the fifth Test between England and India.
A number of supporters said on Twitter they had been targeted by racist abuse from other fans at the Birmingham venue on Monday.
Former Yorkshire spinner Azeem Rafiq shared a thread detailing some of the incidents and wrote that they were, “disappointing to read”.
The England & Wales Cricket Board said in a statement it was “very concerned” by the reports.
“I’m gutted by these reports as we’re working hard to make Edgbaston a safe, welcoming environment for all,” Stuart Cain, chief executive at Edgbaston, said on Monday.
“Having seen the initial tweets, I’ve spoken personally to the gentleman who raised them and we’re now speaking to the stewards in this area to establish what happened.