Pakistan’s former prime minister Imran Khan is expected to appear before an anti-graft tribunal on Wednesday, as police tightened security across the country a day after the opposition leader’s arrest sparked violent protests.

Khan, who spent Tuesday night in custody, will attend a hearing inside police headquarters in Islamabad, according to a police statement. Government investigators are expected to seek to remand him into custody for 14 days, the legal maximum.

Authorities in three of Pakistan’s four provinces imposed emergency orders on public gatherings after unrest erupted on Tuesday when Khan’s Pakistan Tehreek-e-Insaf party called for nationwide protests. Two people were killed and several injured as the turmoil spread, according to the party, and a crowd in Lahore set fire to the gates of a military general’s home.