Karnataka chief minister Siddaramaiah on Wednesday said that anyone speaking in favour of Pakistan is wrong and it amounts to treason.

He added, however, that an inquiry is on in connection with the alleged mob lynching of a man reportedly shouting the 'Pakistan zindabad' slogan in Mangaluru.

"If the 'Pakistan zindabad' slogan was shouted, it is wrong, whoever it is. Inquiry is still going on, a case has been registered, let the report come. It will be clear as to what action should be taken against whom," Siddaramaiah said, responding to a question by reporters on killing of a person in Mangaluru allegedly for shouting 'Pakistan Zindabad' slogan.

"If anyone speaks in favour of Pakistan, it is wrong, it is treason," he added.

Home minister G Parameshwara said, a person was "lynched" in Mangaluru, and while interrogating those behind the incident, they have claimed that the victim shouted a 'Pakistan zindabad' slogan.

"It is being further investigated. Only those arrested said this," he said.

"Nearly 20 people have been arrested now. Police are also finding out about the person (deceased) and his origins. We have taken the incident seriously. Further investigations are on and there were many people who had gone to play the cricket match. They are all being questioned to gather information. [The] investigation is very serious," he added.

When asked if the deceased person was from Kerala's Wayanad, Parameshwara said, there is some information claiming this but it needs to be verified, establishing his identity and contacting his parents.

To a question on whether there was any failure on the part of the police, as there are reports that they allegedly tried to project it as a case of suicide initially, he said, "We have no such information. If any such thing is there, it will come out from the investigation. If any police failures are identified, appropriate action will be taken."

The home minister assured that the case has been taken seriously and there should be no apprehensions that it is being taken lightly.

However, according to police, the deceased has been identified as Ashraf from Pulpalli village in Sultan Bathery Taluk of Wayanad district in Kerala.

The incident had happened during a local cricket match near the Bhatra Kallurti temple in Kudupu village on the outskirts of Mangaluru, on 27 April, the police said.

Ashraf was allegedly assaulted with sticks, resulting in multiple injuries that led to internal bleeding and shock, police said adding he was declared dead at the hospital.