DENVER -

Colorado Democrats gave initial approval to expanding background checks on firearm purchases and imposing ammunition limits as the battle over stricter gun laws gets under away at the state Capitol.

A House committee voted 7-4 with Republican opposition on Tuesday to require background checks on private gun sales and online firearm purchases.

The vote came after several hours of testimony from those who say measures are needed to curb gun violence, and people concerned their right to bear arms is being restricted.

The committee also voted 7-4 to make it a crime to have or sell magazines with 15 rounds or more. The bill was amended from it's initial ban on 10 round magazines.

The bills are responses to the mass shootings at an Aurora movie theater and a Connecticut elementary school.

Debate lasted from 10 a.m. until just after 10 p.m. Tuesday.