HARTFORD, Conn. — Newtown and its schools are putting up a stiff fight against a wrongful-death lawsuit filed by the parents of two children killed in the Sandy Hook Elementary School shooting, questioning whether the lawsuit was filed on time and objecting to information requests by the parents’ attorney.

The legal wrangling has slowed the case in Danbury Superior Court.

Donald Papcsy, the lawyer for the parents of Jesse Lewis and Noah Pozner, said some of Newtown’s court filings have been unusual and could result in what he called unnecessary, additional legal costs for the families.

The lawsuit alleges security measures at the school weren’t adequate when a gunman killed 20 first-graders and six educators on Dec. 14, 2012.

No other school shooting victims’ families have sued the town.