Changhua plans to check 933 farms

Shih Chung-liang vows tighter checks as fipronil-tainted eggs reach the market

Food and Drug Administration demands explanation from local authorities

Officials prohibit transport of eggs and chickens from suspect farm

The move is in response to global concern over contaminated eggs in recent years

2,303 boxes of contaminated eggs made it to consumer markets in Taipei and New Taipei between Jan. 27 and Feb. 13