Pakistan-based Haqqani network, a Taliban-affiliated group, was designated a terrorist network by the US and United Nations in 2012, the State Department said in a statement.
Under it's Rewards for Justice program, the State Department authorized rewards of up to USD5 million each for information leading to the location of Aziz Haqqani, Khalil al-Rahman Haqqani, Yahya Haqqani, and Abdul Rauf Zakir.
It also has increased its previous reward offer of up to USD5 million for information on the group's leader, Sirajuddin Haqqani, to up to USD10 million, the statement said.
Aziz Haqqani is Sirajuddin's brother and is involved in logistical operations and command decisions involving cross-border attacks on ISAF and Afghan forces.
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Khalil al-Rahman Haqqani, Sirajuddin's uncle, is a senior member of the terrorist group and has raised funds for the Taliban. He has been linked to al-Qaida terrorist operations.
He also has overseen the detention of hostages captured by Haqqani and Taliban fighters. The US government designated him as a Specially Designated Global Terrorist in 2011.
He has delivered funds to HQN commanders and al-Qaida members, and has also served as Haqqani's primary liaison with foreign terrorists fighting in the region. He was designated a Specially Designated Global Terrorist this year, it said.
Abdul Rauf Zakir is the group's chief of suicide operations. He also oversees HQN's weapons training program.
"Based in Pakistan, Haqqani network conducts cross-border attacks in Afghanistan and is considered the most lethal insurgent group targeting International Security Assistance Force (ISAF) and Afghan personnel," the statement said.