Nepali Congress Joint General Secretary Mahendra Yadav has been attacked with a sharp weapon on Wednesday.
Yadav was attacked with a khukuri while he was returning home after attending a program at Bhrikutimandap in Kathmandu.
Police have arrested a man for his alleged involvement in the attack on a Congress leader.
Metropolitan Police Range, Kathmandu spokesperson Kumod Dhungel said that they have taken Shayam Sapkota of Nuwakot under control for investigation.
Yadav, who has sustained injuries on his head, has been taken to the hospital for treatment.