In that incident, a village council or Panchayat ordered the rape of a 16-year-old girl because her brother had raped a 12-year-old girl.
Kareem, the police spokeswoman, said Ashfaq was still at large but Wadda has been arrested and charged with raping Ashfaq's sister.
That brings the total number of arrests to 24.
The Pakistan has launched a manhunt against the remaining accused. "Still the Western world's female politicians are right on it and will all get together light candles, wear a T shirt and shout at the men and tsk tsk them, that'll do it", another added.
Nadia Rahman, Amnesty's campaigner in Pakistan, appealed on Islamabad to crack down on the so-called village councils that prescribe horrific crimes against women, often in revenge for acts committed by others.
"A jirga [village council] had ordered the rape of a 16-year-old girl as punishment, as her brother had raped a 12-year-old", a police official was quoted as saying by AFP. The girl had gone outside to cut grass and the boy jumped on her, covered her with a cloth and raped her.
Both families involved filed a complaint with local police, despite the 12-year-old's family initially wanting to keep the matter quiet, Dawn newspaper reported. The perpetrator of the second rape is believed to be the brother of the first victim.
Police said medical examinations have confirmed rape in both cases.
Younis said the two males who allegedly carried out the rapes could face the death penalty.
Pakistan ranks 130th on the United Nations Gender Inequality Index, and 143rd out of 144 countries on the World Economic Forum's Global Gender Gap Index.
The victim's family had registered a case against Wada in Women Police Centre.
Jirgas, or village councils formed of local elders, are a traditional means of settling disputes in the rural areas, where courts and lawyers are not always accessible. Such councils do not, however, hold any legal standing.
The panchayat was convened on July 18 where the council ruled that the brother of the girl should rape the accused's 16-year-old sister, the news agency quoted the First Information Report.