MANILA, Philippines — Sen. Panfilo Lacson warned that arrest warrants would be issued against former representative Elizaldy Co and two others if they continue to snub the Senate investigation on the flood control project mess. Lacson, chairman of the Senate Blue Ribbon Committee conducting the probe, said the next public hearing would be on Jan. 19. The Senate president pro tempore said the committee would subpoena persons it already invited before but who did not show up. These include former Public Works secretary Manuel Bonoan, former Education undersecretary Trygve Olaivar, former special envoy to China Maynard Ngu, and Co, who fled the country at the height of the scandal. Lacson said if those who are subpoenaed still fail to attend, he would recommend to Senate President Vicente Sotto III the issuance of warrants for their arrest. "Olaivar and company were invited but did not show up. We already subpoenaed them. If they still won't show up, we can issue warrants for their arrest," Lacson said on Sunday.