内容摘要：Shortly after the birth of her second child, Cormac, she was faced with a dilemma.

Shortly after the birth of her second child, Cormac, she was faced with a dilemma.

A gunman has shot dead two top aides of the mayor of Mexico City, Clara Brugada.The mayor's private secretary, Ximena Guzmán, and Brugada's adviser, José Muñoz, were killed on their way to work on Tuesday morning local time.

Witnesses said an armed man first opened fire on Guzmán, who had stopped her car by the side of a busy avenue to pick up her colleague, and then on Muñoz, who was about to get into Guzmán's car for their morning commute.The gunman is believed to have escaped on a motorbike and have had at least one accomplice. The possible motive for the killing is still unknown but the attack is the latest in a series of murders of local politicians across the country.Mayor Brugada was visibly upset during a news conference when she recalled how she had "shared dreams and struggles" with her two aides over the years they had worked for her.

She said she would ensure the murders would not go unpunished.President Claudia Sheinbaum was informed of the shooting during her daily morning news conference by the security minister, Omar García Harfuch, who has himself been a target of an armed ambush in the past.

President Sheinbaum described it as "a deplorable incident" and offered Mayor Brugada, who is from the same party as the president, all the support she may need.

Police seized a motorbike and another vehicle they think was used in the attack, while forensic experts examined Guzmán's bullet-pierced car.The government said there were "high safety standards in place" and BESS were a protection against "future energy shocks".

BESS hold excess energy generated by wind and solar farms and then release it into the grid when the power is needed most.Lithium-ion batteries - found in phones, e-bikes and electric vehicles - are used in large numbers.

Mr Griffin warned the scale of BESS meant firefighters were having to learn new techniques."There can be complications with vapour clouds and fires will last a long time," he added.