What began as a festive campaign march quickly turned into a scene of terror in the Mexican state of Veracruz on Sunday night when a mayoral candidate Yesenia Lara Gutiérrez was gunned down alongside three other people.

Axar.az reports, citing CNN, Mexican President Claudia Sheinbaum confirmed the attack during her morning press conference on Monday and said she had no information yet about the motive. She added that her government is in coordination with Veracruz state officials and offered federal support if necessary, including contact with the state attorney general’s office.

The mayoral candidate, a member of Sheinbaum’s ruling Morena party, was among four people killed in the shooting, according to the state attorney general’s office. Another three people were wounded.

Authorities are still investigating the matter and are promising justice.

Attacks on political candidates are common during election cycles in Mexico.

Last year, the country saw a record number of victims from political-criminal violence, with Data Cívica, a human rights organization, reporting 661 attacks on people and facilities. Many of the victims either held or were running for municipal-level positions.