|Lien Chan, R , spoke to reporters after his son was shot while giving a speech for his Taipei mayor campaign [AFP]
Taiwanese media say that the son of Lien Chan, a former Taiwanese vice president, has been shot in the head and critically wounded.
The government-owned Central News Agency and other outlets say that Lien Sheng-wen was shot while giving a speech for his Taipei county mayor elections' campaign.
The assailant was arrested shortly after the shooting.
According to local media reports, the gunman was a member of a gang and appeared to have no political motive.
Taiwanese mayoral candidates were launching last-minute voter appeals on Friday ahead of local polls that could have a major impact on the president's signature policy of improving relations with China.
Voters are scheduled to go to the polls on Saturday to elect mayors and local officials in five large cities around the island.
The Lien family has been prominent force in Taiwan politics for decades. Lien and his son are both members of President Ma Ying-jeou's ruling Nationalist Party.
Saturday's elections pit hopefuls from Ma's party against rivals from the pro-independence Democratic Progressive Party in three newly constructed constituencies - urban and rural agglomerations in Kaohsiung, Tainan and Taichung - as well as existing voting areas in Taipei and its suburbs.
While the perennially hot-button issue of relations with China has not figured prominently in the campaigns, Saturday's winning party is likely to carry momentum into the presidential elections in March 2012, which will almost certainly feature Ma against a still unnamed DPP candidate.