Yemen-based Houthis — the last of Iran-backed groups still fully present in the regional war that began 14 months ago — are slowly escalating attacks on Israel with an eye to avoid full-out retaliation.

The Israeli military said several people were lightly injured after its air defenses failed to intercept the projectile, which struck a playground in the city.

The Yemen-based Houthi militant group said Wednesday it fired a ballistic missile at the Tel Aviv area in central Israel, an attack that prompted air raid sirens to sound but caused no damage. Israel’s military said it intercepted the missile before it crossed into Israeli territory.