Police have arrested Aleema Khan, the sister of Pakistan's jailed ex-prime minister Imran Khan, at her house in Lahore, a spokesperson from Khan's Pakistan Tehreek-e-Insaf party said on Sunday.
The arrest was made ahead of a planned protest march by Khan's party on September 27.
A notification issued by Lahore's district administration said she has been arrested and sent to jail for 30 days.
"According to intelligence reports, her presence at any public place will pose a grave threat to public safety," the district administration said.
Imran Khan's party has organised a march to Islamabad next week demanding his release.
Pakistan's Interior Minister Mohsin Naqvi said on Saturday that the government would do everything it could to stop the protest march.
A close aide to Khan, Zulfi Bukhari, described the arrest of Khan's sister as "absolutely despicable".
"The fear of the 27th protest is clearly taking its toll," Bukhari added.
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