Security remained heightened in airports around Australia

Security remained heightened in airports around Australia on Monday with more intense screening of luggage after law enforcement officials said they had thwarted a plan to bring down an airliner.
Japan Today

HINTS
S Security
V [remained]
C [heightened]
セキュリティは高められたまま

補足
[in] airports どんな→[around] Australia オーストラリアの空港で
[with] (more intense) [screening] [of] luggage 荷物の検査

[after] その後で

S law enforcement officials
V [said]
O (that)
機関が言いました。

S they
V [had thwarted]
O a plan
彼らが計画を阻止した

V [to bring down]
O an airliner.
飛行機を撃ち落とす

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