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K.M. Chaudary, Associated Press
People mourn the death of a family member who was killed in a deadly bomb blast Monday, during a funeral in Lahore, Pakistan, Tuesday, Feb. 14, 2017. Markets and businesses were closed across much of Pakistan's Punjab province Tuesday in mourning for over a dozen people killed in the suicide bombing claimed by a breakaway Taliban faction.

LAHORE, Pakistan (AP) — Markets and businesses were closed across much of Pakistan's Punjab province Tuesday in mourning for 13 people killed in a suicide bombing claimed by a breakaway Taliban faction, police said.

Flags at government buildings flew at half-staff, and lawyers boycotted court proceedings a day after the attack in the provincial capital, Lahore, said police officer Nazar Hayat.

The bomber targeted police escorting a rally by pharmacists protesting amendments to a law on drug pricing. Official funerals were held Tuesday for seven police, including two senior officers, who were killed in the attack.

Nearly 60 people were wounded in the bombing.

The attack was claimed by Jamaat-ul-Ahrar, which said it was revenge for Pakistani military operations against militants in tribal regions near the Afghan border.