United States Senator John Kerry has arrived for top-level talks inPakistan, the first senior US visitor to Islamabad since the killing ofOsama bin Laden earlier this month.

Mr Kerry's visit comes two days after Pakistan's parliament called for an end to US drone strikes on its territory.

Pakistani MPs also demanded that operations similar to that which discovered and killed the al-Qaeda leader never be repeated.

John Kerry, who is the chair of the US Foreign Relations Committee, will meet Pakistan's president and the prime minister.

Arrivingin Islamabad, he warned that Pakistan-US relations are at a criticalpoint, and warned of serious consequences unless Pakistan backsWashington's continued war on terror.

"It is fair to say thatsome of my colleagues in the House, in Senate, have deep reservationsabout whether or not Pakistan is committed to the same goals orprepared to be a full partner in pursuing those goals," he toldreporters.

"There are calls in some quarters in Congress for ashift in the aid program unless there is an improvement in the currentsituation."

Separately, six people in the United States andPakistan have been charged with providing financial and materialsupport to the Pakistani Taliban.

All six people are of Pakistani origin.

They face a range of charges and if convicted each offence could carry a potential 15 year prison sentence.

Among the six is the 76 year-old Imam of the Miami mosque, his son and a daughter who lives in Pakistan.

Lastweek the Pakistani Taliban claimed responsibility for twin suicide bombattacks on a group of military cadets near the city of Peshawar inwhich at least 80 people were killed.