Marc Grossman, US special envoy to Afghanistan and Pakistan, will leave Friday for meetings in Kabul and Islamabad.

State Department spokeswoman Victoria Nuland said Grossman would also visit neighboring countries.

She said Grossman would speak with Pakistan about how to ”tackle the Haqqani network.”

The group allegedly attacked the US embassy in Kabul this month and Joint Chiefs Chairman Adm. Mike Mullen has called it ”a veritable arm” of Pakistan’s intelligence agency.

Nuland also acknowledged Afghan concerns about US-Pakistani-Afghan talks.

She said Grossman would speak to both parties about the value of continuing the discussions.