Crews in Flint are starting to dig up old lead pipes connecting water mains to homes as part of efforts to allay the city's contaminated water crisis.

Mayor Karen Weaver says work starting Friday will target lead service lines at homes in neighborhoods with the highest number of children under 6 years old, senior citizens, pregnant women, people with compromised immune systems and homes where water tests indicate high levels of lead at the tap.

On Thursday, a crew dug up a service line leading to a Flint home as part of a separate effort funded by group of private, charitable, business and community groups.

Also Friday, Democratic Rep. Dan Kildee of Michigan is set to lead a delegation of 25 members of congress to hear from Flint residents.