About 300 men were gathered into a school in the Askar refugee camp in the east of the city after 30 jeeps and armoured vehicles invaded the camp at about 0700am (0400 GMT).
Israeli occupation forces then proceeded to carry out house-to-house searches as they imposed a curfew and ordered all males aged between 16 and 40 into the school compound.
There were no immediate details on the number of arrests.
Israeli occupation forces have been operating in the town for the past week.
Meanwhile, in the southern West Bank town of Bethlehem, two members of the Palestinian al-Aqsa Martyrs Brigades resistance movement were detained during a raid near the local maternity hospital, Palestinian security sources said.