On the first day of classes since the elementary-school shooting in Connecticut, many schools around the United States are reviewing security plans, and in some cases adding extra law enforcement patrols.

Districts in Florida, Georgia and Alabama are among those asking local law enforcement to add patrols.

Many of the school boards stressed that they already have safety plans that are regularly tested.

In Maryland’s suburbs outside Washington, D.C., Montgomery County Public Schools will have councillors available at each school to help provide students support.