According to Deputy Commissioner Liaqut Ali Chatha, the incident took place at the dargah of Muhammad Ali Gujjar in a village (Chak-95 North) in Sargodha district, some 200 km from Lahore, at around midnight yesterday.
Chatha said it appeared that the caretakers of the dargah had first drugged the visitors and then stabbed and clubbed them to death.
"We have taken five people, including the caretakers of the dargah -- Waheed and Yousuf, into custody for interrogation," he said.
Four injured persons have been shifted to hospital where their condition is stated to be critical.
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According to senior police officer Bilal Iftikhar, one injured witness said there was a clash between two groups of the caretakers of the dargah over its possession.
19 people of both groups, including six members of one family, were killed, the police officer said.
"We have launched an investigation into all aspects of this case to ascertain the facts of this gory incident," Iftikhar said.