Representatives of two major U.S. refineries, Valero and Marathon, were summoned to a meeting with officials of Texas City, in the U.S. state of Texas, after they failed to report power outages that set off a series of extended flare burns earlier this week, local media reported Friday.

The power failures at Texas City refineries operated by Valero and Marathon occurred Tuesday afternoon. Higher-than-allowed level of chemicals were released into the air from the Valero refinery, prompting a report to the environmental agency of Texas.

The power outages knocked several units at Marathon's Texas City refinery offline but did not require an emission report to the state environmental agency, according to the Galveston County Daily News.

However, a long-standing agreement between the city and the industrial facilities requires chemical plants and refineries to report "all out-of-the-ordinary incidents" to the city, including minor spill and fires, said Bruce Clawson, the city's director of emergency management.

Neither Valero nor Marathon reported their incidents to the city, Clawson said. Both Valero and Marathon confirmed that they did not contact city authorities.

Officials of Valero and Marathon met with city official Wednesday afternoon to review the conditions of the reporting agreement, Clawson said.

Earlier this month, Texas Attorney General Greg Abbott charged a subsidiary of British oil giant BP with 46 pollution violations at its Texas City refinery, including an emission linked to the 2005 explosion that killed 15 workers and hurt many more.

The attorney general said more than 45 unlawful pollutant emissions occurred at BP's Texas City facility between 2002 and 2007.