Do not light candles, matches, or lighters until you determine there is no leak. Gas leaks can cause explosions. Report damage to the appropriate utility companies and follow their instructions. If there is a leak, stay out of the house. Do not flush toilets until you know that sewer lines are unbroken.
Electric lines can cause fire.
Shut off all electrical power if there is damage to your house wiring. Do not operate electrical switches or appliances if you suspect a gas leak. They can create sparks which can ignite gas from broken lines. Check your household for injured members. Check your neighborhood for injured people who need help.