A number of people have been injured in an ongoing incident in Rhondda Cynon Taf, police have confirmed.
South Wales Police said officers were dealing with “a serious incident” which happened in Baglan Street, Treorchy, at about midday on Friday.
The force said the street has been closed off and people were advised to avoid the area until further notice.
Ambulance crews are also in attendance as the incident involves a number of casualties.
Labour Rhondda MP Chris Bryant tweeted that it was “a major incident” and asked people to avoid the area.
Mr Bryant said: “I sincerely hope nobody is extremely hurt.”
A Wales Air Ambulance landed in Ynyswen at 13:00 GMT from Mid Wales Airport in Powys.