ISLAMABAD (AP) — Pakistani opposition leader Imran Khan suspended talks with the government Thursday after it appointed a new police chief in the capital ahead of a possible crackdown on thousands of anti-government protesters who have besieged parliament.

Khan, a famed cricketer-turned-politician, and fiery cleric Tahir-ul-Qadri have led massive protests from the eastern city of Lahore to the gates of parliament in Islamabad to demand the resignation of Prime Minister Nawaz Sharif, accusing him of rigging the vote that brought him to power last year.